I know there is a rule for changing the balls surface once league play has begun but does that include practice too.  Can you change the balls surface once practice has started for the night of bowling?  One guy in the league says you can and a different guy says you cannot.  I cannot really find anything in the rule book.

thanks

18/2 When may I alter the surface of my bowling ball?
a. Cleaning – Cleaners approved for use any time may be utilized before, during or after
certified competition; cleaners approved for only before and after competition may only be
used during these times.
b. Sanding – You are permitted to sand the surface of your bowling balls prior to certified
competition; however, the use of abrasives is strictly prohibited once the first ball is thrown
in the competition.
c. Polishing – You are permitted to polish the surface of your bowling ball prior to certified
competition. However, once tournament or league play begins, the use of a ball spinner is
strictly prohibited; only an automated, self-contained polishing machine may be used.

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So, while you may not alter the surface of a ball by using any abrasive substance, you can use the LustreKing and put polish on it to make the ball skid longer.  Some bowlers will bring in sanded balls and take it to the LustreKing during league to get more length and it is legal.