Paint Experts: Process Advice Needed

Spray epoxy primer on the metal surfaces first. Look on the epoxy spec sheet and see what the time window for recoating without sanding is, and spray your 2K right on top of the epoxy. No sanding needed on the epoxy if you spray the 2K within a certain amount of time. I use Southern Polyurethane epoxy, and I think it has a 72 hr. recoat window, but that time varies between MFG's.

When you are ready to spray color, just wet sand the 2K with 600, tack it off and squirt it!