Wire wheel and POR15. I have spent the last year POR15 my frame. Mastercoat makes good stuff as well, much cheaper than POR15, but not the same beast. Most paint shrinks as it dries, the moisture leaving the paint and leaves tiny holes where water can get through. POR15 does the opposite. goes on thin like fingernail polish and expands as it dries, making a perfect seal. No more rust ever again. A tiny can goes a LONG way. I did most of a frame rail with one tiny can. You can get 5 cans on Ebay for 50ish bucks IIRC. Ii still have 4 cans in my garage...lol.