Phenomenon
Irregular cracks like bird footprint appear on topcoat film during drying.
Cause
A. Applying at too cold temperatures.
B. Solvent in topcoat infiltrates into the previous paint film during initial topcoat application.
Repair
Remove the cracked area and refinish.
Prevention
A. Use fast type thinner.
B. Apply urethane primer-surfacer(PS-330, PS-550) before applying topcoat.