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Could be adhesion problems. Do an adhesion test at each stage of the process to see where the problem is, if there is one. By this I mean, take a blank that you messed up and seal it. When dry, prime as usual. Take a razor blade and cut a grid into the plug that is around 1/8 squares. Now take a piece of tape and apply to the grid, then pull off. If you have primer particles on the tape, you have adhesion problems. If no primer, the primer is ok. If ok, apply the paint, and do the test again. If no problems, apply your clear coat and do the last test. If you have a good combo, you will not see any primer, paint, clear coat on the tape. If you do see any of these on the tape, there is your problem. If the primer is not holding right, nothing else you put on will hold. Likewise with the paint. If there is an adhesion problem with the paint, the clear will not hold.
Jigman
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