Which ball are you looking at getting back to 2k w/ polish? 900 Global used to have a refinishing chart prior to their website redesign. In general, if you want the ball to stand up and read the midlane a little earlier, I would do something like 500, 750, 2000 & polish. If you want a touch more length, then go with 500, 750, 1000, 1500, 2000 & polish. The difference between the 2 is giving the ball surface some teeth to bight into the oil or rounding down the teeth on the surface a touch to produce a bit more length. Even though you may not get the cover to near factory finish, you will definitely get it fairly close and will see a similar ball reaction nonetheless. The covers will take surface changes and adjustments very well. I hope that helps some.