First off, whoever said you have to do 6 sides is an uninformed jerk. ( not refering to the previous reply ) Depending what exactly you want to do with the ball is the key. If you want box finish, you better use a Haus or other resurfacing machine. Just do 2 sides ( any 2 sides you want ) 320, 400, 600, and up if you need it. The ball will react fine. I have never had any problem with resurfacing any ball for anybody. You know them coming in and saying, this ball doesnt react like it use to.