1 part epoxy primer and more primer..

grassy said

the fly in the ointment for me is the welding I need done.. but you and I are on the same page..

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I do not understand how there would be any fly in ointment. You have to cut back to bare metal and remove whatever primer is used to weld. And after done welding recoat with epoxy or whatever and then filler or 2k.