Why are there uneven little craters on my painted wall?

What is it?

Bubbles form on the surface while painting, which then break to form a concave depression or crater.

What are the possible causes?

  • Shaking a partially filled can.
  • Using old paint.
  • Applying paint too rapidly, especially with a roller.
  • Using a roller cover with the wrong nap length.
  • Rolling or brushing excessively and repeatedly.
  • Applying gloss or semi gloss finishes over a porous surface.

How can I fix this problem?

  • All paints have a tendency to foam. New generation water-based paints are however designed to allow the bubbles to break during painting so that the paint applies well and the surface appears smooth.
  • Do not roll or brush too much.
  • Avoid using paints that are more than a year old.
  • Use a roller with a short nap when you apply gloss and semi gloss finishes.
  • Prime and seal porous surfaces before using glossy paints.
  • Sand problem areas before repainting.