for the body guys

Garry in AZ said

From bare metal, a good epoxy primer like PPG DP90 will rustproof the car as long as you don't sand it off. From there, depending on the quality of the metalfinishing, you will need a good primer or maybe high build primer and maybe a bit of filler to block the car and get it straight and level before paint. Then prep for paint as usual, and shoot the color/clear.

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Do not let bare metal sit. Prime with epoxy primer immediately. If it's been exposed to the air you will probably
need to re sand and use wax and grease remover after sanding. If the body is fairly straight and does not have a lot
of body work follow up with catalyzed primer over the epoxy primer per instructions for the products. You will have to address repair work later, but get bare metal coated ASAP. In future do a panel at a time or nothing more than you can
immediately do.