Coverstock texture changes are a important part of bowling. To help match up ball with conditions.
As a rule of thumb
coarser sanding makes a ball hook less, but earlier. (it smooths out the reaction)
smoother surfaces hook later and harder. (because of retaining more energy and revolutions)
of coarse this depends on the conditions at the time.
When you polish a ball, your basically wanting it to skid farther.( make the tire tread not grip as much in the oil.). By doing this the ball also retains more energy and rev's for hooking down the lane.
Also the ball will travel that extra 6" to 1 foot further out of the oil before turning to the pocket
Think of it like when a car starts hydroplaning on a wet road. The tires are spinning and your sliding down the road, then BAM! your tires hit dry and off you go.
Polishes are not really waxes, some are compounds with a grit component which alter the grit on the ball. Others are like fill in glazes (for lack of a better term), which will leave the underlying grit and there are variations in between.
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