If your car is inside out of the rain, then spray it with PickleX and don't touch it.
If you have to leave it outside, then go with a good two part primer as stated earlier.
Some would say do the body work and then appl,y the primer, others say spray the primer, then doi bodywork, sealing all the bodywork between layers of primer.
You may want to go ahead and put a coat of sandable primer oin after the last coat of epoxy. It's easier to sand than the epoxy, which you will have to spray again after sanding if waiting longer than its' recoat window.