Relevance of Ambient Conditions

• Temperature/humidity restrictions often ignored

• Air and surface temperature can be too hot or too cold for proper film formation and curing

• Relative humidity can be too high for proper curing (and for moisture curing products, too low)

• Surface temperature should be at least 5°F greater than the dew point to prevent condensation (not always visible) - condensation can oxidize freshly prepared metal and effect film formation, curing, and adhesion of the film

• Acceptance criteria is found in the specification and manufacturer’s product data sheets

Inspection of Coating Materials and Mixing

• Verify complete mixing– Hand/mechanical/boxing– Thinning (within VOC

limits)– Partial kits– Pot life

• Confirm that the correct coatings and colors are applied – can be very complicated when many substrates involved

Coating Application Inspection – Pay Special Attention to Limited

Access/Stripe Coats

Coating Application Inspection – Verify Back Rolling and Back

Brushing

Coating Application Inspection Number of Coats

• Verify correct number of coats applied

• Monitor drying time between coats

• Verify cleanliness between costs

Verify Complete Coverage, but Avoid too Much

Coating

6

Coating Application Inspection - Monitor Wet

Film Thickness

7

Measure Dry Film Thickness (DFT) Non-Destructive Tests

• Ultrasonic gage can measure DFT on Concrete (ASTM D6132). SSPC-PA9, number of measurements, test locations, interpretation of results.

• Magnetic gages are used to measure DFT on steel substrates (ASTM D7091)

• Eddy current gages are used to measure DFT on non-ferrous metal substrates (ASTM D7091)

• SSPC-PA2, Number of measurements, test locations, interpretations of results

Trouble shooting - Destructive DFT Measurements

• Destructive tests can measure the thickness of individual coats as well as total system thickness (ASTM D4138)

Inspect Joints and Sealants

• Improperly sealedjoints allow for waterintrusion

10

Inspection Summary

11

INSPECTION CATEGORY INSPECTION VERIFICATION

Surface Preparation — Equipment Specified equipment/methods used

Surface Preparation — Metallic Substrates Cleanliness per specification and industry standards

Surface profile per specification

Surface Preparation — Concrete Substrates Cleanliness per specification

Satisfactory moisture content, pH

Surface Preparation — Existing Coating Removal of loose/poorly adherent coating

Removal of grease, oil, chalk, dust, dirt

Ambient Conditions Air and surface temp, RH, dew point per specification

Coating Materials and Mixing Proper coating materials and colors applied

Coatings thoroughly mixed; thinned as required

Multiple component coatings used within pot life

Application Specified application methods used

Surfaces clean between coats

Back rolling and back brushing done as specified

Stripe coats applied as specified

Complete coverage achieved

Correct number of coats applied

Ample drying time between coats

Correct thickness applied (wet)

Correct thickness applied (dry)

Film continuity (runs, pinholes, gloss, etc.) per spec

Inspection of Commercial and Architectural Cleaning and

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