I think POR15 would work much better with no prep at all. I POR'd my floorboard and later when I pulled the frame I noticed just a small speck of POR15 had leaked through a hole. This stuff bonded though dirt and slight rust. Finish is rough as hell but it ain't going nowhere.
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1972 Nova 355, 4 spd, rusty but something to drive.
1972 Pro-touring Cutlass S in the works....still
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