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Titus69Yeah thatd be chill as long as it's not knobbed or anything, aluminum rails are never painted cause its shiny and also doesnt rust, I think.
mystery3It corrodes, just not into an orangey-brown powder, and not as quickly in typical outdoor weather on earth.
OP can tap it and judge by the sound as well. Should probably get out in the world and investigate lots of materials in his or her environment. These are fairly common metals and not difficult to tell apart.
_IRRELEVANT_Why does what type of metal matter, and what is the ideal type to slide on?