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So I have been hitting pvc rails for almost 4 years and can do back and front 2s and swaps but i still can't hit metal rails. I try them almost every time im skiing but never get them. Every time I test if the rail is not sticky and it never is but I still always feel like my skis are not sliding on the rail when I try it.
Even a nice slick metal rail will feel 'grippier' than PVC, my best advice is to go faster and land completely perpendicular to the rail with a solid wide stance so that you feel balanced and confident on-rail even if it's a little sticky.
start with the smallest ones, and if there are any of those big metal tubes or even a small round rail try those first because the round surface gives less resistance. Even if there's a box with round metal coping try just grinding the coping on the box or stalling on it from the side.