Also, get it to a rolling chassis with body aside and you can blast the chassis, degrease the whole lot and get it coated in epoxy primer and a decent top coat. If you haven’t already, have a look at bilt hamber, corrolles (sp), dinitrol, fertan etc and choose your weapons. I’d really recommend electrox primer. Hydrate 80 will do you well for a rust convertor that doesn’t need rinsing off. Go epoxy paints if money permits too as it can flex and isn’t brittle. Bilt hamber epoxy mastic is amazing stuff. My cars painted in about 10 different products in different places and the Bh products are just a step above the rest in my opinion