Foaming / Cratering

Formation of bublles (foaming) and resulting small, round concave depressions (cratering) when 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 lated paint.
• Applying (especially rolling) paint too rapidly.
• Use of a roller cover with wrong nap lenght
• Excessive rolling or brush of the paint.
  
• Applying a gloss or semigloss of the paint over a porous surface.

Solution :

• All paint will foam to some degree during application, however, higher quality paint are formulated so the bublles break while the paint is still wet, allowing for good flow and appearance.
• Avoid excessive rolling or brushhing of the paint or using paint that is more than a year old.
• Apply gloss and semigloss paint with a short nap roller, and apply an appropriante sealer or primer before using such paint over a porous surface.
• Problem areas should be sanded before repainting.