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Close up image of a surface that has small, round conclave depressions when bubbles break in a paint film.

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 of low quality, or with wrong nap length.
  • Excessive rolling or brushing of the paint.
  • Applying a gloss or semi-gloss paint over a porous surface.

Solutions

  • 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 cover, and apply an appropriate sealer or primer before using such paint over a porous surface.

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