where is the rust? there is some stuff you can use that will convert the rust so it doesnt spread. you can get it in a spray can, this stuff usually takes 2 light coats if i remember correctly. or there is a black liquid that comes in a small bottle that you can brush on. DO NOT GET IT ON YOUR PAINT. you should be able to get both at your local paint supply store. national coatings, H-O, etc.
Depending on where the rust is though you might be just as well off to cut it out and weld in a patch if youre handy.
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