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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 Causes:
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 wrong nap length.
Excessive rolling or brushing of the paint.
Applying a gloss or semi-gloss 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 appearance. Avoid excessive rolling or
brushing of the paint or using paint that is more than a
year old. Apply gloss and semi gloss paints with a short
nap roller, and apply an appropriate sealer or primer
before using such paint over a porous surface. Problem
areas should be sanded before repainting. |
