They sell cans of POR. Spray can type. If it is humid where you are it is best to epoxy prime first to seal it tho. POR leaves pores in the paint if it is humid when applied, and it will have annoying little red dots in the paint there.
I got more paint on my frame than most do on the hood LOL Epoxy primer, POR, and several layers of hot rod black. Took the frame off painted it. Put it back on. Did bodywork and got primer all over everything over the years. Then took it back off and painted it again before final bodywork and paint. That time I mask the bottom and frame. Tired of painting that now.
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