Salt and pepper effect

Cause

• Material insufficiently filtered.
• Incorrect storage temperature (waterborne base coat). 
• Material past end of shelf life.
• Insufficiently stirred base coat.

Prevention

• Use a suitable strainer.
• Observe storage temperature (as given on the Technical Data Sheets).
• Stir the tinters in the mixing machine regularly.

Remedy

• Sand and respray with uncontaminated material.