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 sealed joints allow for water intrusion 10

Inspection Summary 11 INSPECTION CATEGORYINSPECTION VERIFICATION Surface Preparation — EquipmentSpecified equipment/methods used Surface Preparation — Metallic SubstratesCleanliness per specification and industry standards Surface profile per specification Surface Preparation — Concrete SubstratesCleanliness per specification Satisfactory moisture content, pH Surface Preparation — Existing CoatingRemoval of loose/poorly adherent coating Removal of grease, oil, chalk, dust, dirt Ambient ConditionsAir and surface temp, RH, dew point per specification Coating Materials and MixingProper coating materials and colors applied Coatings thoroughly mixed; thinned as required Multiple component coatings used within pot life ApplicationSpecified 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 Painting Webinar - Questions