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4 AREAS OF TESTING AND EVALUATION
Environment Air and Surface Temperature Average temperature for successful exterior painting is 10-28 Degrees Celsius or 50 to 95 degrees Fahrenheit. Ideal temperature is 15-25 degrees Celsius or 60-65 degrees Fahrenheit. Air Contaminants Dust and Dirt. Humidity Relative humidity High humidity and low temperatures can cause moisture to form on a freshly painted surface. Available Light
Surface Condition Type of Surface Metal,wood,plaster/drywall,cement based products,painted surfaces,plastics,etc. Smooth,Glossy Surfaces Porous Rough Surfaces Chemical Contamination Flexible or Rigid Surfaces Moisture Content Wood 12% or less. Plaster and Concrete 10-12% or less. Alkali or Acid Surfaces Concrete has an alkali type surface. Use Litmus paper to test the “PH Scale” (Percentage of hydrogen) . Acid Surfaces have low PH 1-6. Alkali surfaces have high PH 6-12.
Application and Coating Checks Film Thickness. Even, smooth gloss or sheen. Free from contamination. No runs,sags,drips or holidays (misses or weak spots).
Final Inspection Quality of finish. Adhesion check.
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