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daveaa-
Prevention rather than proofing, but yeah. Had read about it a few places, including it being mentioned in a thread on here somewhere. Car engine oil slathered all over the frame with a rag then leave it in the sun a couple weeks, reapplying every so often so it can work it's way into the pores of the steel. I'm not too convinced that it's the sun that does this, rather than the time left but I've put it somewhere sunny in case.
lmamammal
Building my mate a runaround for the summer. Thought I would try out raw/motor oil treatment, so it's currently sunbathing soaking up the oil.... Never again am I going to strip a frame by hand.