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longjohns has the best info. The dual action sander or random orbit (air powered is best) will yeild by far the finest most polished results. All of this depends greatly on what the metal is, and the desired end result, but the teacher in the class should (SHOULD) be well schooled in this as well, and be able to provide the best final answer overall.. Otherwise, if your friend is cute, have her put on a revealing top and head for a local body shop... They'll probably be glad to help!
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Time flies like an arrow, fruit flies
like a banana.
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