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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)

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Relevance of Ambient Conditions

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  1. 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 Relevance of Ambient Conditions

  2. 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 Inspection of Coating Materials and Mixing

  3. Coating Application Inspection – Pay Special Attention to Limited Access/Stripe Coats

  4. Coating Application Inspection – Verify Back Rolling and Back Brushing

  5. Verify correct number of coats applied Monitor drying time between coats Verify cleanliness between costs Coating Application Inspection Number of Coats

  6. Verify Complete Coverage, but Avoid too Much Coating

  7. Coating Application Inspection - Monitor Wet Film Thickness

  8. 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 Measure Dry Film Thickness (DFT) Non-Destructive Tests

  9. Destructive tests can measure the thickness of individual coats as well as total system thickness (ASTM D4138) Trouble shooting - Destructive DFT Measurements

  10. Inspect Joints and Sealants • Improperly sealedjoints allow for waterintrusion

  11. Inspection Summary

  12. Inspection of Commercial and Architectural Cleaning and Painting Webinar - Questions

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