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Description:
Small bubbles appear in the dried coating, including those that have broken to form craters.
Cause:
Air is being trapped in the coating due to one of the following:
- The coating is too thick.
- There is air is trapped in brush or roller, possibly by applying the material too fast.
- The coating was mixed or agitated too much.
- Application was performed at elevated temperatures.
- Using external heat to encourage faster dry times.
- Painting over a porous surface.
Prevention:
- Use the proper solvent to thin coating.
- Manually stir the product versus shaking the material when mixing.
- Remove excess paint from the brush or roller.
- Air, substrate, and paint temperature should be between 50F and 90F unless otherwise stated.
Cure:
During application and before setup, burst bubbles with tip of brush. After partial setup, apply a wash coat of thinner or water (depending on product type). After setup, allow surface to dry, then spot sand, feather, & touchup.
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Courtesy of The Rohm and Haas Paint Quality Institute
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