Quote:
Originally Posted by 3rzrunner
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Maybe on an already not-so-rusty frame, but on one like OP's it seems risky since you may just be painting over a big chunk or dirt or scaly rust. The oil undercoat doesn't run that risk. If anything, the dirt helps it cake up and stick nicely. Out overseas(the Caribbean, Asia, various parts of the Middle East etc) they love to spray old oil underneath to prevent damage caused by constant dirt road driving and salt exposure, and it is a proven method. A car restorer friend told me about some nearly rust-free 50's Cadillacs that were original northeast cars. Underneath had at least an inch thick of oily, dirty undercoat. Once that stuff was scraped away, it revealed some very mint floor pans.