• Poor preparation
• Surface contamination
• Poor cleaning
• Not tacking off
• Not sanded
• Exceeding stated re-coat times
• Dry application of primer systems
• Incorrect system selection
• Fluid tip too small or too large
• Insufficient flash-off times
• Spraying temperature too low or too high
  

Prevention

• Sand the surface according to the technical data sheet
• Use the correct spraying technique. Avoid heavy application.
• Use correct fluid tip size
• Allow recommended flash-off times in relation to: spraying temperature, air speed, thinner choice
  

Remedies

• Strip and clean or sand down and repaint