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Not this. Dull them under foot for about 6-8 inches going each way out from the front and back binding and in between the bindings. Leave the rest relatively sharpened for SOME edge hold on groomers and such.
i wouldn't go around fucking with your skis like that, especially if you are new to park. the more you hit rails, the more your edges will dull so you will be fine. if you have to ask our advice on whether to file your edges, you probably need our advice on how to do it too. so really ask yourself, "how often am i going to be using these in the park" before you do things that are difficult and potentially expensive to fix if you don't like it.
but if the rails are sketchy, say like 90% of east coast rails are, wouldn't you want to not have super sharp edges underfoot so they wont catch on all the chips/ice/shitty paint? I understand the more grip thing, but I don't think you want that kind of digging-into-the-rail grip, I've dulled my edges underfoot for a while and I don't have any trouble gripping/scissoring on rails and getting good hold
its actually kinda true though. i find that with skis that are super dull, and freshly waxed, it can be hard to grip rails. spinning out and pretzeling can be tougher with extremely dull skis. still, you are going to want pretty round edges if youre newish to rails.
If you have access to a wet-grinder, that's definitely your best bet if you don't feel like filing the edges down. My buddy did it to his bangers last year and they were silky smooth on all the rails. When I say WET-grinder, yes thats the one with water. Otherwise you can stress the edges with too much heat and they'll snap.