Personally, I would blast the area with sand, glass or soda and get rid of all the rust. I have found that if you don't get rid of all the rust prior to putting a coating on, it will bubble up and reappear.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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