If you are that concerned, you need to sandblast and undercoat, in that order! This will depend on how deep seated the rust is. For the most part, wire brush off all loose flaky rust, treat with a good quality rust converting solution, and paint with a anti rust metal preparation paint. Your local body shop will be able to advise you on better brands and available treatments.
I hope this helps.
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Friday, November 23rd, 2007 AT 5:56 PM