Marcus, with what you've done, about twice around the block will be enough. I'm going to offer my opinion even though you don't need it. I wouldn't risk the exposure to the bare metal anymore than I had to. If you're going to epoxy prime it, I'm ok with that for short term. Your metal work is beautiful but there's always pits and spots to deal with. It would be a shame to have to blast the truck before painting and deal with the after effects of that before painting. When I was younger, we got away with bare metal for a while. Things were wet sanded over and over with no obvious affects. Now, a finger print or a moist breath is enough to cause rust. You've made good decisions all along on this so take my opinion as just that.