Matrix, first I have to ask out of curiousity, it seems that every time you type the word paint, you leave off the T? I'm just curious why.
About your problem....there are most definitley plenty of issues regarding paints sticking to primers/other paints/surfaces. Laquer over enamel, enamel over laquer, some paints w/ flex agents can soften primer making like a gel... Some primers can never harden over fiberglass(heat reaction).
Exactly what paint and primer are you using, brand and type?