Polishing an EPX will not hurt the ball by any means, it will diminish the ball's early roll and massive mid-lane, leaving only a hard arc on the backend. You may find that the ball doesn't have enough on the backend once you've tried it polished, but it's a very condition specific ball to begin with, so if it works for a certain condition, go for it.
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Jon Brandon
Columbia Regional Staff 04-06
2003 PBA West Region Rookie of the Year
"You don't score, until you score......"