How did you rustproof your bottom?

Woody'sScamp said
Cruiser, I did do the wire wheel, down to bare metal, in 3 sections. PITA, it took me forever on a creeper. Last time I ever do that at 60+. Then I used POR-15, not optimal being on your back! Then I roughed that up a little and I sprayed Eastwood undercoating (cans) over that. We will see how it holds up as I plan on keeping my car a long time also.
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You dont need to sand the por15 if you catch it while its still tacky. About 4 hours depending on the humidity and it has isocyanates in it so be careful. It gets a bad rap now and then cause people dont use it correctly. Its tough stuff. I've tested it a lot.