Gun Kote, applied properly will not chip, crack or peel. Going back through the preparation process will usually find the issue that caused the problem. The use of Glass Bead instead of the 120 grit aluminum oxide will cause the coating to peel. Not degreasing well will also cause the coating to peel. In all cases it is something in the preparation process that has caused the problem.
When refinishing firearms we have found oil will creep from the barrel receiver and cause the coating to “lift”. To resolve this problem preheating the barrel/receiver to curing temp will leach the oil from the parts and solve some of the problem.