I'm needing some painting advice. I'm redoing a d-17 using Electrolysis for stripping it down. I'm having an adhesion problem with the primer.. I shot it with the shopline epoxy primer(white) back in the summer, I waited the proper time for the primer to set before spraying.. put down 2 coats, I then painted those parts within the 72 hour window with shopline paint.. I prepped the metal/cast with wax and grease remover just to be sure it was clean.. The end product looks awesome so I thought.

Assuming that you did indeed have the surfaces clean  your problem is the surfaces need to be roughed up so the Epoxy primer can "tooth in" to the bare metal. There are two ways to acomplish this. One is to sand the bare metal before you prime with the proper grade of paper which is listed on the primer "p" sheets. The other is to use a self etching primer under the epoxy.  My prefferance is to sand, others like the self etching primers and use them for everything. The reason for the self etching primers existance is so production shops can skip the sanding step and squirt paint on new or chemicaly stripped metal. The etching primers WILL make a believer out of you for air supplied respirator.