Adhesion loss between polyester putty and the substrates.
Common Cause
Substrate not properly prepared (main reason).
Unsuitable polyester putty.
Improper use of infrared baking machine.
Repair
Sand the damaged area and redo the repair. (Before application of the putty, better to clean the existing paint finishes with thinner, if the existing paint color fades, sand the existing paint finishes to ensure good substrate).
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