Very similar for a lot of people that polish just equals over under and a hard to control reaction. It looks good on the wall in the pro shop but it's usually not the best reaction. 4k gives almost as much backend motion just seems to smooth it out a little. If he hasn't touched it up since we talked last tell him to hit it again. That surface doesn't last forever. He should really hit that by hand again every other set or so and put it on a ball spinner every 30-50 games.
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