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You can polish any metal slide, the question is how long it'll stay that way. Easiest method is sandblast the slide to get rid of the paint and get it to a uniformly coarse finish, and start from ~200 grit sandpaper and work your way up to ~1000 or more, in 200-400 grit increment. Then finish with some kind of metal polish. If its like aluminum it should not be too bad with oxidizing(might get a bit dull after a while). But if its pot metal than it can get grey or black overtime as it oxidizes. You can use automotive clearcoat after polishing to seal the finish.
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