Hey Savin,
Look at Rust Bullet of Texas. They make an automotive blend that is silver and it bonds to rust and kills it. I have used it on the frame, cab, and will eventually coat the bed box and other sheet metal after stripping. This stuff if great because you don't have to thin it. You can shoot it straight out of the can. Any filler needed for body work can be used over the Rust Bullet coating.
Good Luck with your project!
Wes
