I had MUCH success with a milwaukee electric grinder and 3m bristle discs for some pretty substantial surface rust. These things are the cat's pajamas, and they're not abusive to the sheet metal. They're a little pricey, but they seem to last forever. (Eastwood sells them too, but the green 7" seemed to hole up much better.)

http://rshughes.com/products/048011_27685.html?


[b]1957 Chevy Big Window 3100[.b]

In the Stovebolt Gallery
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It ain't broke 'til you can't fix it any more.