[gtome]

I dont know how epoxy in a can is, but the regular mixed stuff has to be topcoated before the cure window is up (usually 3 days). So you may have to spray epoxy on, then spray a primer/surfacer over it within the cure window. Most regular primers dont have a recoat window, so you could leave it in that til your ready. I think if it were me I would just spray Picklex or Ospho on it til you were ready, then scuff it all down with a scotchbrite, then your epoxy/primer/paint.