Formation of bubbles (foaming) and the 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 wrong nap length
  • Excessive rolling or brushing of the paint
  • Incorrect application equipment (e.g. Applying a gloss or semi-gloss paint with a long nap roller)

 

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. Apply gloss and semi-gloss paints with a short nap roller.


More problem solving advice

Yellowing

Development of a yellow cast in aging paint solvent-based enamels