Pinholes

Cause

• Air trapped in putty.
• Excessive putty film thickness.
• Incorrect spray viscosity for surfacer materials. 
• Excessive surfacer film thickness.
• Insufficient flash-off between coats.

Prevention

• Follow the application recommendations on the Technical Data Sheets.
• Choose the right hardener for the temperature. 
• Observe flash-off times.

Remedy

• Sand down pinholes, apply surfacer if necessary and reapply paint system.