Buttering? Rails?

Just wondering if buttering could possibly damage skis. If you had a pair of stiff park skis for jumps and buttered on them, could the topsheet crack across them? Also, does grinding rails harm your skis as long as you don't nail your bases on jagged areas? Thanks...
 
I love rails and so far no major damage... it dulls ur edges under ur boot but that wont really effect you that bad... i like my edges dull cuase i caught a edge some how on a handrail once and wont forget that day
 
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