I got regular steel conduit, it slides great. I did look at the black steel and thought about buying that but they didnt have any good sizes. I got all my stuff from Menards, but you can find more variety and cheaper prices at Lowe's or Home Depot, I just didnt feel like driving that far. As for galvanized, my friend has some and he pretty much just waxes his skis and rail before he hits it and it slides fine. As for rusting, yes its easier to rust, but i mainly wipe my rail off whenever we get a wet snow, so it should be fine. If it rusts just sand it off.