4000 is so fine that all it does really is take the gloss off the ball. Alot of people don't like out of the box finishes, so 4000 is perfect to get that off. Also used correctly it can tame down the breakpoint and make it smoother off the dry. Once you get into the 2000,1000 and less number the more you are looking at taking the surface down. But 4000 is so fine, again it really shouldn't be relied upon to take down surface and make the ball hook more.
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George Palumbo
Mvpbowler300@yahoo.com
Mvpbowler@aim.com
2002 True Amateur Challenge Champion