+---
+title: High-Performance Coatings
+category: Architectural / Finishes
+toc_depth: 3
+description: >
+ When to use: chemical-resistant and specialty resin coating systems (multi-coat
+ epoxy, aliphatic polyurethane, polyurea, zinc-rich primer, epoxy mastic, coal tar
+ epoxy, vinyl ester lining) on concrete, masonry, steel, and gypsum board in
+ demanding service - mechanical and electrical rooms, laboratories, food-service
+ and pharmaceutical areas, wastewater facilities, parking structures, secondary
+ containment, and industrial process spaces requiring corrosion, chemical,
+ abrasion, or washdown resistance beyond standard paint.
+ Not intended for: standard interior decorative painting (use
+ [[sync/interior-painting]]); standard exterior building paint on wood, stucco, or
+ clapboard (use [[sync/exterior-painting]]); fluid-applied resinous floor toppings,
+ terrazzo, and broadcast-aggregate epoxy flooring (use [[sync/resinous-flooring]]);
+ intumescent or cementitious fireproofing; roof coatings and waterproof membranes
+ (roofing division); fire-rated assembly steel coatings (fireproofing sections).
+---
+
+# Scope {toc}
+
+## This standard governs high-performance protective coating systems applied to interior and exterior building surfaces in service environments more demanding than those served by conventional architectural paint. {note}
+
+## High-performance coatings are distinguished from decorative paint by their resin chemistry and their performance role: they resist corrosion, chemical attack, abrasion, or aggressive washdown rather than merely providing color and sheen. They are specified where a coating failure would compromise the substrate (steel corrosion, concrete chemical erosion) or the operation (loss of cleanability in a food or pharmaceutical area, containment breach in a chemical zone). {note}
+
+## Covered substrates are concrete floors and walls, masonry and CMU, structural and galvanized steel, and gypsum board. {note}
+
+## Covered system types are multi-coat epoxy (solvent-borne and waterborne), aliphatic polyurethane topcoats, spray-applied polyurea, organic and inorganic zinc-rich primers, high-build epoxy mastic, coal tar epoxy, vinyl ester linings, and fluoropolymer finishes. {note}
+
+## This standard applies to both new construction and renovation. {note}
+
+### Coating systems shall be specified by service environment and substrate, not by appearance alone.
+
+### Each coat in a multi-coat system shall be from a single manufacturer's qualified system; mixing primer from one manufacturer with intermediate or finish coats from another is prohibited unless inter-manufacturer compatibility is confirmed in writing by both manufacturers.
+
+## Resinous flooring boundary {note}
+
+### Self-leveling, slurry, and broadcast-aggregate epoxy floor build-ups are floor topping products, not protective coatings, and are governed by [[sync/resinous-flooring]] rather than this standard. {note}
+
+### Thin-film protective coatings applied to floors (sealers and traffic coatings under ~20 mils that do not build a wearing surface) remain within this standard. {note}
+
+## Other exclusions {note}
+
+### Standard decorative latex and alkyd painting on architectural surfaces is governed by [[sync/interior-painting]] and [[sync/exterior-painting]]. {note}
+
+### Intumescent and cementitious fireproofing coatings, roof coatings, waterproofing membranes, and protective coatings on structural steel within fire-rated assemblies are outside this standard and are governed by their respective fireproofing, roofing, and waterproofing sections. {note}
+
+# Referenced Standards {toc}
+
+## Materials, surface preparation, application, and testing shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
+
+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## SSPC and NACE merged into AMPP (Association for Materials Protection and Performance) in 2021; the standards below are now published by AMPP but retain their original SSPC and NACE designation numbers, both of which remain in wide industry use. {note}
+
+| Standard | Title |
+|----------|-------|
+| SSPC-PA 1 | Shop, Field, and Maintenance Coating of Metals (2024) |
+| SSPC-SP 1 | Solvent Cleaning |
+| SSPC-SP 6 / NACE No. 3 | Commercial Blast Cleaning |
+| SSPC-SP 10 / NACE No. 2 | Near-White Metal Blast Cleaning |
+| SSPC-SP 13 / NACE No. 6 | Surface Preparation of Concrete (2024) |
+| SSPC-VIS 1 | Visual Standard for Abrasive Blast Cleaned Steel |
+| ICRI 310.2 | Concrete Surface Profile (CSP) Guideline |
+| ASTM D4060 | Abrasion Resistance of Organic Coatings by the Taber Abraser |
+| ASTM D4541 | Pull-Off Strength of Coatings Using Portable Adhesion Testers |
+| ASTM D7234 | Pull-Off Adhesion Strength of Coatings on Concrete |
+| ASTM F2170 | Relative Humidity in Concrete Floor Slabs Using In-Situ Probes |
+| ASTM F1869 | Moisture Vapor Emission Rate Using Anhydrous Calcium Chloride |
+| ASTM B117 | Operating Salt Spray (Fog) Apparatus |
+| ASTM D522 | Mandrel Bend Test of Attached Organic Coatings |
+| ASTM D523 | Specular Gloss |
+| ASTM E84 | Surface Burning Characteristics of Building Materials |
+| MPI #72 | Polyurethane, Pigmented, Over Epoxy Coating System |
+| NFPA 101 | Life Safety Code |
+| NSF/ANSI 61 | Drinking Water System Components - Health Effects |
+
+# Submittals {toc}
+
+## Action submittals {note}
+
+### The Contractor shall submit the following action submittals for review before ordering or applying any coating material:
+
+- Product data sheets (TDS) for each coating material in the proposed system, listing solids by volume, recommended DFT per coat, recoat windows, and cure schedule
+- Manufacturer's written system designation confirming all coats are a compatible qualified system
+- Safety data sheets (SDS) for each component
+- Color samples and gloss samples for each finish coat at the specified gloss level
+- Manufacturer's surface preparation and application instructions for each substrate
+- VOC content documentation demonstrating compliance with the applicable federal and state limits
+- NSF/ANSI 61 certification for any coating in potable-water contact service, where applicable
+- ASTM E84 flame-spread and smoke-development classification for coatings in egress paths and occupied spaces
+
+```datasheet
+label: Action submittals required
+type: checkbox
+options:
+ - Product data sheets (TDS) per coat
+ - System compatibility designation letter
+ - Safety data sheets (SDS)
+ - Color and gloss samples
+ - Surface preparation and application instructions
+ - VOC compliance documentation
+ - NSF/ANSI 61 certification (potable water service)
+ - ASTM E84 flame-spread classification
+defaults:
+ - Product data sheets (TDS) per coat
+ - System compatibility designation letter
+ - Safety data sheets (SDS)
+ - Color and gloss samples
+ - Surface preparation and application instructions
+ - VOC compliance documentation
+```
+
+## Informational submittals {note}
+
+### The Contractor shall submit the following informational submittals:
+
+- Applicator qualification records demonstrating completed projects of similar scope and chemistry
+- Manufacturer certification of the applicator, where the warranty requires a certified applicator
+- Field test reports for concrete moisture (ASTM F2170 or F1869), surface profile, and ambient conditions
+- Daily application records logging material batch numbers, mixed quantities, ambient and substrate temperature, relative humidity, and dew point
+- Mock-up acceptance record
+
+```datasheet
+label: Informational submittals required
+type: checkbox
+options:
+ - Applicator qualification records
+ - Manufacturer applicator certification
+ - Concrete moisture test reports
+ - Daily application records
+ - Mock-up acceptance record
+defaults:
+ - Applicator qualification records
+ - Concrete moisture test reports
+ - Daily application records
+ - Mock-up acceptance record
+```
+
+## Closeout submittals {note}
+
+### The Contractor shall submit the following closeout submittals before final acceptance:
+
+- Field DFT measurement reports per SSPC-PA 1 for each coat and the total system
+- Field adhesion (pull-off) test reports
+- Manufacturer's written warranty
+- Maintenance and recoating instructions, including approved cleaning chemicals
+- Record of attic-stock finish material delivered
+
+```datasheet
+label: Closeout submittals required
+type: checkbox
+options:
+ - Field DFT measurement reports (SSPC-PA 1)
+ - Field adhesion test reports
+ - Manufacturer's written warranty
+ - Maintenance and recoating instructions
+ - Attic-stock delivery record
+defaults:
+ - Field DFT measurement reports (SSPC-PA 1)
+ - Field adhesion test reports
+ - Manufacturer's written warranty
+ - Maintenance and recoating instructions
+```
+
+# Quality Assurance {toc}
+
+## The most common high-performance coating failures - delamination, intercoat adhesion loss, and undercure - originate in surface preparation, substrate moisture, ambient conditions, and missed recoat windows rather than in the coating material itself. {note}
+
+## Because these defects are usually invisible until the coating is in service, this standard relies on hold points: inspection sign-offs that must be obtained before the next operation proceeds. Retroactive correction of a surface-prep or DFT deficiency generally requires complete removal and reapplication of the affected system. {note}
+
+## Applicator qualifications {note}
+
+### The applicator shall have successfully completed coating work of comparable substrate, chemistry, and DFT on at least three projects within the preceding five years.
+
+### Where the manufacturer's warranty requires a certified applicator, the applicator shall hold current certification from the coating manufacturer.
+
+### Spray-applied polyurea and polyurethane linings shall be applied only by an applicator trained and approved by the lining manufacturer for plural-component spray equipment.
+
+## Mock-up {note}
+
+### The Contractor shall apply a mock-up of each complete coating system on a representative substrate area of at least 100 ft² before beginning production work.
+
+### The mock-up shall establish the standard for surface preparation, color, gloss, texture, and total system DFT.
+
+### The mock-up shall be retained until final acceptance of the coating work.
+
+### Production work shall not begin until the Engineer of Record accepts the mock-up in writing.
+
+## Hold points {note}
+
+### Coating work shall stop for inspection and written sign-off at each of the following hold points before the next operation proceeds:
+
+- After surface preparation and before priming, to verify cleanliness, profile, and substrate moisture
+- After each coat and before the next coat, to verify DFT and surface condition
+- Before any immersion or chemical service contact, to verify full cure
+
+```datasheet
+label: Required inspection hold points
+type: checkbox
+options:
+ - After surface prep, before prime (cleanliness, profile, moisture)
+ - After each coat, before next coat (DFT, condition)
+ - Before immersion or chemical contact (full cure)
+defaults:
+ - After surface prep, before prime (cleanliness, profile, moisture)
+ - After each coat, before next coat (DFT, condition)
+ - Before immersion or chemical contact (full cure)
+```
+
+# Environmental and Service Conditions {toc}
+
+## The single most important specification decision is matching the coating system to the actual chemical and physical exposure. Over-specifying wastes cost; under-specifying causes premature failure that is expensive to remediate in an occupied or operating facility. {note}
+
+## Chemical exposure class {note}
+
+### Mild service covers periodic water washdown and occasional mild detergent (mechanical rooms, general utility areas). Moderate service covers routine cleaning chemicals and dilute acids or alkalis (food-service, laboratories). Severe service covers concentrated acids, solvents, fuels, or immersion (secondary containment, process areas, wastewater contact). {note}
+
+### The coating system shall be selected to resist the most aggressive chemical the surface will encounter in normal operation and in a credible spill or upset condition.
+
+```datasheet
+label: Chemical exposure class
+type: radio
+options:
+ - Mild (water washdown, mild detergent)
+ - Moderate (cleaning chemicals, dilute acids/alkalis)
+ - Severe (concentrated acids, solvents, fuels, immersion)
+default: Moderate (cleaning chemicals, dilute acids/alkalis)
+```
+
+## UV exposure and color retention {note}
+
+### Aromatic polyurethanes and epoxies chalk and yellow under ultraviolet light, often within months on exterior or skylight-exposed surfaces; aliphatic polyurethanes and fluoropolymers retain color and gloss. {note}
+
+### Where the coated surface is exterior or exposed to direct or skylighted sunlight, the finish coat shall be an aliphatic polyurethane or fluoropolymer; aromatic finish coats are prohibited in these locations.
+
+```datasheet
+label: UV exposure of finish coat
+type: radio
+options:
+ - Interior, no direct sunlight (aromatic finish acceptable)
+ - Interior, skylighted or daylit (aliphatic required)
+ - Exterior (aliphatic or fluoropolymer required)
+default: Interior, no direct sunlight (aromatic finish acceptable)
+```
+
+## Specialty service requirements {note}
+
+### In food-processing, pharmaceutical, and healthcare areas, the finish coat shall be a non-porous, washable formulation; an antimicrobial or FDA-compliant formulation shall be provided where the project program requires it.
+
+### Coatings in potable-water contact service shall be certified to NSF/ANSI 61; coal tar epoxy shall not be used in potable-water or food-production contact.
+
+```datasheet
+label: Specialty service requirement
+type: checkbox
+options:
+ - Antimicrobial finish (food/pharma/healthcare)
+ - FDA-compliant finish
+ - NSF/ANSI 61 potable-water contact
+ - None
+defaults:
+ - None
+```
+
+## Fire performance {note}
+
+### In egress corridors and occupied spaces where the building code requires a Class A interior finish, the coating shall be tested to ASTM E84 with a flame-spread index ≤ 25 and a smoke-developed index ≤ 450.
+
+### The coating system shall meet the surface-burning classification required by the governing building and life-safety code for its location.
+
+```datasheet
+label: ASTM E84 surface-burning classification required
+type: radio
+options:
+ - Class A (FSI ≤ 25, SDI ≤ 450)
+ - Class B (FSI 26-75, SDI ≤ 450)
+ - Class C (FSI 76-200, SDI ≤ 450)
+ - Not required for this location
+default: Class A (FSI ≤ 25, SDI ≤ 450)
+```
+
+# Coating System Selection {toc}
+
+## A high-performance system is defined by its coats and their roles: a primer that bonds to and protects the substrate, optional intermediate coats that build film thickness and barrier resistance, and a finish coat that provides appearance, UV resistance, and cleanability. The system type drives substrate preparation, DFT, and cure requirements. {note}
+
+## System type {note}
+
+### Common system types and their primary applications: {note}
+
+- **Two-coat epoxy** (epoxy primer plus high-build epoxy finish): standard system for mechanical rooms and secondary containment in mild-to-moderate service.
+- **Three-coat epoxy/urethane** (epoxy primer, epoxy intermediate, aliphatic polyurethane topcoat): standard system for exterior steel and UV-exposed interior areas; benchmarked by MPI #72.
+- **Zinc-rich primer plus epoxy plus urethane**: provides cathodic corrosion protection for structural steel in aggressive environments, using either organic or inorganic zinc primer.
+- **Epoxy mastic**: high-build, self-priming single-coat system for maintenance painting over tightly adherent existing coatings or minimally prepared steel.
+- **Coal tar epoxy**: two-component system for below-grade, submerged, or wastewater-contact surfaces; not permitted in potable-water or food-contact service.
+- **Waterborne epoxy**: low-VOC two-component system for interior occupied spaces during renovation, with performance generally limited to mild service.
+- **Spray-applied polyurea or polyurethane lining**: fast-cure, very-high-build (40-125 mils) monolithic lining for secondary containment and water/wastewater service; requires a specialized plural-component applicator.
+- **Fluoropolymer (FEVE or PVDF) topcoats**: premium exterior finishes for maximum color and gloss retention with a 15-20 year performance expectation.
+
+### The specified system type shall match the substrate and the exposure class established in this standard.
+
+```datasheet
+label: Coating system type
+type: select
+options:
+ - Two-coat epoxy (primer + high-build finish)
+ - Three-coat epoxy/urethane (primer + intermediate + aliphatic urethane)
+ - Zinc-rich primer + epoxy + urethane
+ - Epoxy mastic (self-priming, single coat)
+ - Coal tar epoxy (below-grade/submerged)
+ - Waterborne epoxy (low-VOC, mild service)
+ - Spray-applied polyurea/polyurethane lining
+ - Fluoropolymer topcoat system
+default: Two-coat epoxy (primer + high-build finish)
+```
+
+## Substrate {note}
+
+### The substrate type drives primer chemistry: epoxy primers bond to blast-cleaned steel and prepared concrete, zinc-rich primers require near-white blasted steel, and galvanized steel requires a primer formulated for adhesion to zinc. {note}
+
+### The primer shall be the manufacturer's primer qualified for the actual substrate; a primer formulated for steel shall not be applied to concrete or gypsum board.
+
+```datasheet
+label: Substrate type
+type: radio
+options:
+ - Structural steel
+ - Galvanized steel
+ - Concrete floor
+ - Concrete wall / CMU
+ - Gypsum board
+default: Concrete wall / CMU
+```
+
+## Finish gloss {note}
+
+### Higher gloss generally cleans more easily and resists chemical staining better, while lower gloss hides surface irregularities; semi-gloss is the common default for food-service and cleanroom areas, with full gloss where maximum cleanability is required. {note}
+
+### The finish coat gloss shall be measured at 60° per ASTM D523 against the specified range.
+
+```datasheet
+label: Finish coat gloss (ASTM D523, 60°)
+type: radio
+options:
+ - Flat (≤ 10 GU)
+ - Eggshell (10-25 GU)
+ - Semi-gloss (35-70 GU)
+ - Gloss (≥ 70 GU)
+default: Semi-gloss (35-70 GU)
+```
+
+## Finish color {note}
+
+### The finish color shall match the accepted color sample; the color and its location extents are commonly shown on the finish schedule.
+
+### Finish color and any color zoning shall be as indicated. [[drawing: room finish schedule]]
+
+```datasheet
+label: Finish color selection method
+type: radio
+options:
+ - Single color, manufacturer standard
+ - Single color, custom match
+default: Single color, manufacturer standard
+drawing_ref: "room finish schedule"
+```
+
+# Surface Preparation {toc}
+
+## Surface preparation is the foundation of coating performance: cleanliness removes contaminants that block adhesion, and profile (anchor pattern or concrete texture) gives the coating mechanical grip. Inadequate preparation is the leading cause of field failure and cannot be corrected after coating. {note}
+
+## Solvent cleaning of steel {note}
+
+### Oils, greases, and soluble contaminants prevent both proper blast profile and adhesion, and remain even after abrasive blasting if not first removed. {note}
+
+### All steel surfaces shall be solvent-cleaned per SSPC-SP 1 to remove oil, grease, and soluble contaminants before any mechanical surface preparation.
+
+## Abrasive blasting of steel {note}
+
+### Commercial blast (SSPC-SP 6) is the minimum cleanliness for epoxy primer on structural steel in mild service; near-white blast (SSPC-SP 10) is required for high-build epoxy, zinc-rich primer, and immersion or severe service. {note}
+
+### Blasted steel shall be visually verified against SSPC-VIS 1 to confirm the specified cleanliness level.
+
+### The angular anchor profile on blasted steel shall be 1.5-3.0 mils unless the manufacturer's TDS requires a different profile for the primer.
+
+```datasheet
+label: Steel surface preparation standard
+type: radio
+options:
+ - SSPC-SP 1 (solvent clean only)
+ - SSPC-SP 3 (power tool clean)
+ - SSPC-SP 6 / NACE No. 3 (commercial blast)
+ - SSPC-SP 10 / NACE No. 2 (near-white blast)
+ - SSPC-SP 11 (power tool to bare metal)
+default: SSPC-SP 6 / NACE No. 3 (commercial blast)
+```
+
+```datasheet
+label: Steel anchor profile
+type: range
+unit: mils
+min: 1.0
+max: 4.0
+step: 0.5
+```
+
+## Concrete surface profile {note}
+
+### Concrete must be mechanically profiled - by shot blast or diamond grind - to expose a clean, sound, textured surface; a smooth or laitance-covered slab will not hold a resin coating. {note}
+
+### CSP is a frequent failure point because specifications call out a profile number without naming the test method or the allowed preparation method, and contractors then substitute light grinding that yields only CSP 1-2 where CSP 3 was needed. {note}
+
+### Concrete surface profile shall be specified and verified to the ICRI 310.2 CSP scale, achieved by shot blast or diamond grind; acid etching shall not be used to achieve profile.
+
+```datasheet
+label: Concrete surface profile (ICRI 310.2)
+type: radio
+options:
+ - CSP 2 (light shotblast/grind)
+ - CSP 3 (medium shotblast)
+ - CSP 4 (heavy shotblast)
+ - CSP 5 (very heavy shotblast)
+default: CSP 3 (medium shotblast)
+```
+
+```datasheet
+label: Concrete preparation method
+type: radio
+options:
+ - Shot blast
+ - Diamond grind
+ - Combination (grind edges, shot blast field)
+default: Shot blast
+```
+
+# Substrate Moisture {toc}
+
+## Excess moisture in or behind concrete is the single most common cause of epoxy delamination on slab-on-grade, because vapor pressure drives the coating off the substrate from below. Concrete moisture testing must be a contractual hold point, not an optional check. {note}
+
+## Concrete moisture testing {note}
+
+### Concrete slabs shall be tested for moisture before coating using in-situ relative-humidity probes per ASTM F2170 or anhydrous calcium chloride per ASTM F1869.
+
+### Coating shall not be applied until measured concrete moisture is at or below the acceptance limit for the specified primer.
+
+### Where measured moisture exceeds the standard primer's limit, a moisture-vapor-barrier (MVB) primer rated for the measured level shall be used in lieu of proceeding.
+
+## Slab RH (ASTM F2170) and MVER (ASTM F1869) limits are manufacturer-specific; 75% RH and 3 lb/1000 ft²/24 hr are conservative defaults, while some MVB epoxy primers tolerate 8-10 lb. The acceptance value shall be taken from the specified primer's TDS. {note}
+
+```datasheet
+label: Concrete moisture test method
+type: radio
+options:
+ - ASTM F2170 (in-situ RH probe)
+ - ASTM F1869 (calcium chloride MVER)
+ - Both methods
+default: ASTM F2170 (in-situ RH probe)
+```
+
+```datasheet
+label: Maximum slab RH acceptance (ASTM F2170)
+type: range
+unit: '%'
+min: 70
+max: 90
+step: 5
+```
+
+```datasheet
+label: Maximum MVER acceptance (ASTM F1869)
+type: range
+unit: lb/1000 ft²/24 hr
+min: 3
+max: 10
+step: 1
+```
+
+# Film Thickness {toc}
+
+## Dry film thickness governs barrier performance: too thin and the coating fails to resist chemical penetration or corrosion; too thick and solvent-borne coatings can trap solvent, sag, or mud-crack. DFT must be specified per coat and for the total system, with a measurement and acceptance procedure. {note}
+
+## DFT specification {note}
+
+### Total system DFT scales with service severity: mild interior service is typically 3-5 mils total, moderate chemical service 6-10 mils, severe chemical or immersion service 12-20 mils, and polyurea lining 40-125 mils. {note}
+
+### An epoxy primer shall be applied at 3.0-5.0 mils DFT, with 3.0 mils as the default unless the TDS or service requires more.
+
+### A zinc-rich primer shall be applied at 2.5-4.0 mils DFT.
+
+### Each coat and the total system shall achieve the specified DFT range; areas below the minimum shall receive an additional coat, and areas grossly above maximum shall be evaluated by the manufacturer.
+
+```datasheet
+label: Total system DFT
+type: range
+unit: mils
+min: 3
+max: 125
+step: 1
+```
+
+```datasheet
+label: Primer DFT
+type: range
+unit: mils
+min: 2.5
+max: 5.0
+step: 0.5
+```
+
+## DFT measurement {note}
+
+### DFT shall be measured per SSPC-PA 1, taking a minimum of five spot measurements per 100 ft², where each spot measurement is the average of three gauge readings.
+
+### DFT on steel shall be measured with a calibrated magnetic or eddy-current gauge; DFT on concrete shall be verified by the manufacturer's approved method, since magnetic gauges do not read on nonmetallic substrates.
+
+# Application {toc}
+
+## Ambient and substrate conditions at the time of application determine whether the coating cures to its rated properties. Epoxy applied below its minimum temperature remains tacky, never fully cures, and loses most of its chemical resistance; coating applied to a substrate near or below the dew point traps condensed moisture under the film. {note}
+
+## Ambient conditions {note}
+
+### Most solvent-borne and waterborne epoxies require a minimum ambient and substrate temperature of 50°F; some low-temperature formulations are rated to 25°F. The 50°F minimum is the default unless a low-temperature product is specified for cold-weather work. {note}
+
+### Coating shall not be applied when the ambient or substrate temperature is below the product's minimum application temperature.
+
+### Coating shall not be applied when relative humidity exceeds 85%.
+
+### Coating shall not be applied unless the substrate temperature is at least 5°F above the measured dew point.
+
+### Ambient and substrate conditions shall be maintained within the specified temperature, humidity, and dew-point limits throughout application and initial cure.
+
+```datasheet
+label: Minimum application temperature
+type: range
+unit: °F
+min: 25
+max: 60
+step: 5
+```
+
+```datasheet
+label: Maximum relative humidity during application
+type: range
+unit: '%'
+min: 75
+max: 90
+step: 5
+```
+
+## Recoat windows {note}
+
+### Each coat has a minimum recoat time (so the underlying coat is firm enough) and a maximum recoat time (beyond which the cured surface must be abraded to restore intercoat adhesion). Topcoats applied beyond the maximum recoat window can delaminate with no visible sign until the coating is in service. {note}
+
+### Solvent-borne epoxy intercoat recoat is typically 8-24 hours minimum and 7 days maximum at 77°F; aliphatic urethane over epoxy intermediate is typically 8-24 hours minimum. The recoat window shall be taken from each product's TDS. {note}
+
+### Each coat shall be recoated only within the minimum and maximum recoat window stated in the product TDS for the application temperature.
+
+### Where the maximum recoat window has been exceeded, the surface shall be abraded and cleaned per the manufacturer's instructions before the next coat is applied.
+
+## Cure before service {note}
+
+### Coatings for immersion or chemical service require a full chemical cure - typically 7 days at 77°F - before liquid contact; some polyureas reach service cure within 24 hours. {note}
+
+### A coating in immersion or chemical service shall not be placed in contact with the service liquid until it has reached the full chemical cure stated in its TDS.
+
+```datasheet
+label: Minimum cure before immersion/chemical service
+type: range
+unit: days
+min: 1
+max: 7
+step: 1
+```
+
+# Performance Testing {toc}
+
+## Field testing confirms that the installed system, not merely the can of material, meets the specified performance. Adhesion and DFT are verified on every project; abrasion, corrosion, and flexibility are typically qualification tests submitted with product data. {note}
+
+## Field adhesion {note}
+
+### Field adhesion shall be verified by pull-off testing per ASTM D4541 on steel and ASTM D7234 on concrete.
+
+### Pull-off adhesion shall be a minimum of 200 psi on concrete and a minimum of 300 psi on steel.
+
+### Any pull-off result below the acceptance value shall trigger investigation of surface preparation and re-testing of the affected area.
+
+```datasheet
+label: Minimum pull-off adhesion - concrete (ASTM D7234)
+type: range
+unit: psi
+min: 150
+max: 400
+step: 25
+```
+
+```datasheet
+label: Minimum pull-off adhesion - steel (ASTM D4541)
+type: range
+unit: psi
+min: 200
+max: 500
+step: 25
+```
+
+## Qualification testing {note}
+
+### For coatings in traffic or floor-protection service, abrasion resistance shall be reported per ASTM D4060 (Taber abraser) as a submittal acceptance criterion.
+
+### For coatings on metal in corrosive service, salt-fog corrosion resistance shall be qualified per ASTM B117 for the duration specified in the product category.
+
+### For coatings on substrates subject to movement, flexibility shall be qualified by mandrel bend per ASTM D522.
+
+```datasheet
+label: Required qualification tests
+type: checkbox
+options:
+ - Taber abrasion (ASTM D4060)
+ - Salt-fog corrosion (ASTM B117)
+ - Mandrel bend flexibility (ASTM D522)
+defaults:
+ - Salt-fog corrosion (ASTM B117)
+```
+
+# Regulatory Compliance {toc}
+
+## Coating VOC content is regulated federally and, in many jurisdictions, more strictly by the state. Specifying a solvent-borne epoxy that exceeds the local limit, or that creates an odor or ventilation problem in an occupied building, is a common and avoidable error. {note}
+
+## VOC compliance {note}
+
+### The federal AIM rule (40 CFR Part 59) limits industrial maintenance coatings to 250 g/L; CARB and OTC states limit many categories more strictly, to 100-150 g/L for flat coatings. {note}
+
+### Each coating material shall comply with the VOC limit of the most stringent regulation in force at the project location.
+
+### Where work occurs in an occupied building, the Contractor shall evaluate VOC and odor impact and provide the ventilation required by the manufacturer and the local code; a low-odor waterborne system should be considered for occupied interior renovation.
+
+```datasheet
+label: Applicable VOC limit
+type: radio
+options:
+ - Federal AIM rule (40 CFR Part 59)
+ - CARB / OTC state limit (more stringent)
+default: CARB / OTC state limit (more stringent)
+```
+
+# Coordination {toc}
+
+## High-performance coatings rarely stand alone: steel may arrive shop-primed under another section, and adjacent finishes are governed by separate standards. Compatibility gaps between shop primer and field finish are a frequent source of adhesion failure. {note}
+
+## Shop-primed steel {note}
+
+### Where structural or fabricated steel is shop-primed under [[sync/metal-fabrications]], the shop primer must be compatible with the field finish system specified here, and the compatibility shall be confirmed in both sections. {note}
+
+### Shop-primed steel that will receive the field finish system shall be primed with a shop primer accepted in writing by the finish-coat manufacturer.
+
+### Damaged shop primer and weld zones shall be field-prepared and spot-primed with a compatible primer before the field finish coats are applied.
+
+## Adjacent finishes {note}
+
+### Decorative architectural painting adjacent to high-performance-coated surfaces is governed by [[sync/interior-painting]] and [[sync/exterior-painting]]; resinous floor toppings meeting coated walls are governed by [[sync/resinous-flooring]]. {note}
+
+### Terminations between this coating system and adjacent finishes shall be located and detailed as indicated. [[drawing: finish transition details]]
+
+# Delivery, Storage, and Handling {toc}
+
+## Two-component coatings have limited shelf life and are sensitive to temperature; off-spec or improperly stored material cures unpredictably and voids the warranty. {note}
+
+## Coating materials shall be delivered in the manufacturer's original sealed containers with legible labels showing product name, batch number, and shelf-life date.
+
+## Coating materials shall be stored in a dry, ventilated space within the temperature range stated on the product TDS, protected from freezing and direct sunlight.
+
+## Material that has exceeded its shelf-life date or shows separation, gelling, or skinning that cannot be reincorporated shall not be used.
+
+## Coating components shall be mixed only in the manufacturer's specified ratio and only within the stated pot life after mixing; material beyond pot life shall be discarded.
+
+# Warranty {toc}
+
+## The Contractor shall provide the manufacturer's standard system warranty and the applicator's workmanship warranty for the coating system.
+
+## The warranty shall cover adhesion loss, blistering, peeling, and premature chemical or corrosion failure under the specified service conditions.
+
+## Where the manufacturer's warranty is conditioned on a certified applicator or on a complete single-manufacturer system, those conditions shall be satisfied so the warranty is enforceable.
+
+```datasheet
+label: Workmanship warranty period
+type: radio
+options:
+ - 1 year
+ - 2 years
+ - 5 years
+default: 2 years
+```
+
+```datasheet
+label: Manufacturer system warranty period
+type: radio
+options:
+ - 1 year
+ - 5 years
+ - 10 years
+ - 15 years
+default: 5 years
+```
+
+# Spare Materials {toc}
+
+## A reserve of the exact finish material lets the Owner touch up damage without a color or batch mismatch, which is otherwise difficult once the original lot is exhausted. {note}
+
+## The Contractor shall deliver to the Owner a reserve of finish-coat material from the project lot for future touch-up.
+
+## Spare material shall be in original sealed containers, labeled with product name, color, and batch number, and stored as directed by the Owner.
+
+```datasheet
+label: Spare finish material delivered
+type: range
+unit: gal
+min: 1
+max: 10
+step: 1
+```