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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:
Shaking a partially filled can of paint.
Use of low-quality paint or very old latex paint.
Applying (especially rolling) paint too rapidly.
Use of a roller cover with the wrong nap length.
Excessive rolling or brushing of the paint.
Applying a gloss or semi-gloss paint over a porous surface.

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 semi-gloss paints with a short nap roller (1/4" to 3/8"). Always apply latex wall primer over porous surfaces such as new drywall before painting. Other problem areas should be sanded and spot-primed before repainting.

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