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.
- Shaking a partially filled can of paint.
- Use of low quality paint or very old latex paints.
- 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 semigloss 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 appearance.
- Avoid excessive rolling or brushing of the paint or using paint that is more than a year old.
- Apply gloss and semigloss 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.
Note: Images & information provided by The Rohm & Hass Paint Quality Institute.