Foaming/Cratering
Formation of bubbles (foaming) and resulting small, round
concave depressions (cratering) when bubbles break in a paint
film during paint application and drying.
Possible Cause:
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Shaking a partially filled can of paint.
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Use of low quality paint or very old latex paint.
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Applying (especially rolling) paint too rapidly.
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Use of a roller cover with the wrong nap length.
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Excessive rolling or brushing of the paint.
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Applying a gloss or semigloss paint over a porous surface.
Solution:
All paints will foam to some degree during application; however,
higher quality paints are formulated so the bubbles break
while the paint is still wet, allowing for good flow and leveling
appearance. Avoid excessive rolling or brushing of the paint.
Apply gloss and semigloss paints with a short nap roller.
Always apply a primer or sealer over porous surfaces. Problem
areas should be sanded and spot-primed before repainting.
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