They will rough up the existing surface to get a tooth on it, then epoxy primer and a two-part epoxy paint, which is a dark-gray metallic. Including inside the sponsons. The areas which are not zinc-coated will need a little sanding or glass-beading to get the rust off, I think. I don't know what we're going to do with the bottom of the tub- some kind of lightweight undercoat or something like that.
We are still talking about what to do for fuel tanks. I don't think we're going to the trouble of bladders that fit into the sponsons; with cold fuel going in and out, it virtually guarantees condensation inside there, which in turn makes rust likely, especially in a car that isn't driven daily. I think I would favor plastic or poly tanks that can be slid in from the end, with access ports in the top. We're still looking around on that one.
