Gotcha. Why do you want to paint your truck? If I were you I would look at Paintless Dent Repair (PDR) to fix most of the dents, patch the rust and blend the new paint from the rust into the old paint on the body, remove the decals, buff the paint on the truck, and reapply the decals. I think you would be very impressed with the results. Plus I think the truck would be more valuable as a mostly original survivor with mostly original paint. Just my 2 cents.