Fixing Foaming & Cratering

What Causes Foaming and Cratering?

Foaming (bubble formation) and cratering (small, bowl-shaped depressions) are common paint defects caused by:

• Excessive Agitation – Vigorous shaking or stirring introduces air bubbles into the paint.
• Application Factors – Using rollers too vigorously or applying paint too thickly.
• Contamination – Oils, waxes, or silicones on the surface cause cratering.
• Environmental Conditions – Painting in direct sunlight or low humidity causes rapid solvent evaporation.

Prevention & Cure

1. Allow freshly mixed paint to rest for 15–30 minutes before application.
2. Thoroughly degrease all surfaces before painting.
3. Paint at temperatures between 15–29°C with 40–70% relative humidity.
4. For dried craters: sand smooth, apply compatible primer, and recoat.