Edge mapping due to solvent penetration

Cause

• Area where topcoat was sanded through to substrate not isolated

• Isolated with unsuitable filler/primer

• Filler/primer incorrectly applied

• Insufficient drying of substrate

Prevention

• Solvent test to identify soft substrates

• Isolate using an EP filler or 2K filler; apply filler in several thin spray coats and observe flash-off times

• Avoid sanding through to soft substrate

Remedy

• Dry topcoat thoroughly

• Sand damaged area, isolate and repaint