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ROFL, dude, you are worried about THAT little spot? Sheesh, you should see the patched holes in the rear storage compartments of my 745t... before I rebuilt them could touch the street through the back of my brick. Hell, you should see the bottom of my 745t on a lift... not a pretty sight.
Rust repair is a tricky and difficult thing. The best way depends on the location. If its on a flat surface I would say just get an orbital sander, multiple grades of sand paper, and go nuts. Once you've got the rust off and the metal smooth seal it, paint it, and clearcoat it. Of course, this is assuming you don't care about slight color differences on small spots.
If the metal is pitted sand it as best you can, spray with a rust remover, and treat it, clean it, and proceed as above.
If its wholly deteriorating (like you could rip off a hunk of metal with your bare hand) the problem requires a bit more aggressive tactics. Get a pair of metal scissors and cut out as much of the deteriroated metal as you can. Once completed, use some automotive hardening compound (either fiberglass reinforced or regular... the fiberglass stuff is REEEEAAALLy nasty to work with) to rebuild the area. Where possible you generally want to try and rebuild a piece from both sides, layering over the metal at teh edge from both the insie and outside to build a solid new piece. The material is stronger than you might think once it hardens, and should hold up to just about anything it runs into (pebbles, rain, snow, ice, whatever). BTW, do it in stages, building it up slowly.
good luck,
rt
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