Tiny holes from the undercoat that penetrate through the top surface.
Causes
- Improper surface cleaning
- Too much spray gun air pressure
- Not thoroughly sanding body filler or primer surfacer
- Improper mixing and application of body filler
Prevention
- Thoroughly sand and clean repair area
- Use appropriate spray gun air pressure and distance
- Thoroughly mix fillers as per product data sheet recommendations, use the scale when possible
- Thoroughly sand filler and apply surfacer and sealer to the repair
Correcting
- After surface is fully cured, sand the affected areas to a solid substrate and refinish as needed
