FOAMING/CRATERING:

DESCRIPTION

Formation of air bubbles (foaming) and resulting small, round concave depressions (cratering) when bubbles break in a paint film during drying.

POSSIBLE CAUSE

• Shaking a partially filled can of paint or using too high of a speed when using a drill mixer.
• Excessive brushing or rolling – applying a paint too rapidly – will drive excess air into the film.
• Use of a roller cover with wrong nap length.
• Applying a gloss or semi- gloss paint over a porous or unsealed surface.
• High heat during application speeds up drying; any bubbles or craters that form dry before they can break and level out.
• Using a thinner/reducer that is inappropriate for the coating.

SOLUTION

• All paints will foam to some degree during mixing and application; most paints are designed to allow these bubbles to break and flow smooth during drying.
• Allow the coating to dry thoroughly, sand the coating smooth, and repaint.
• Slowly stir partially filled containers to prevent entrapping excess air in the coating.
• If there is a very noticeable amount of air bubbles during application try slowing down.
• Follow label and data page directions for appropriate applicator. Determine the correct roller cover based on the coating being applied and the surface. On smooth
• Surfaces, a mohair, 1/4" , or 3/8” roller nap is usually sufficient, On textured surfaces, a 3/4 “ nap or greater is needed.
• Prime porous surfaces before top coating.
• Follow label and data directions for the appropriate environmental conditions.
• Allow each coating to dry properly before top coating.
• Follow label and data page directions for the appropriate thinner/reducer and amount to use.

SYSTEM

INTERIOR

Suggested Finishes Reapply the same or an upgr ade coating.

EXTERIOR

Suggested Finishes Reapply the same or an upgrade coating.