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If you do alot of metal sanding mcmaster carr sells 20 yard rolls of emery paper for about $20 in fine, medium and coarse. it really does the trick for sanding metal as it leaves a somewhat finer...

are you using sand paper sand paper or metal sanding paper (emery, silicon carbide zirconia ETC)? if you are just using regular sandpaper it won't abrade away the metal much since the abrasive is too...