Foaming / Cratering

Formation of bubbles or foam and resulting small, round concave depressions. When bubbles break in a paint film, during paint application and drying.

Possible Causes:

  • Shaking a partially filled can of paint.
  • Using low-quality latex paint, or paint that is old.
  • Applying (especially rolling) paint too rapidly.
  • Using a roller cover with the wrong nap length.
  • Excessively rolling or brushing the paint.
  • Applying a gloss or semi-gloss paint over a painted surface without first priming.


  • Avoid excessive rolling or brushing.
  • Avoid using paint that is more than a year old.
  • Prime porous surfaces before applying paint.
  • If applying gloss or semi-gloss paints, prime before painting and use a short nap roller.
  • Avoid vigorous shaking of the paint can or swirling the brush in the paint.
  • Sand problem areas before repainting.