Since urethane cover stocks, like plastic, are non-pourous, sanding and polishing the ball can be done with relative ease to customize its performance to each bowler.
Unlike a , which gives bowlers the added power of backend (an aggressive hook once the ball gets to the dry part of the lane), urethane cover stocks take a more gradual path to the pins. Because the ball won't absorb oil, bowlers can find the right line to the and watch the ball predictably travel that path over and over.
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Despite more controllability and predictability than reactive resin, urethane cover stocks generally will have a less-effective angle to the pocket, making strikes harder to throw.