ok, heres preping your skis for rails 101
round out the edges in between your bindings, make um freakin round. this makes a huge difference, and it also is safer for the ski. if your edges are sharp, they dig in, dont slide as fast, and get super bured up (slows the ski down a ton) it also helps protect from rail damadge to an extent. dont go nuts if your not sliding  bunch of rails, cause you reant put more edge on.
Lets go skiing