Icetink,
Rick was correct in saying that I use the kitty litter technique. Save your money and don't use the Powerhouse thing. Here's what you need to do. Get yourself a 5 gallon bucket, a ball cup, some rubbing alcohol or Simple Green, a rag, and a 3-5 lb. bag of the cheapest kitty litter you can find. The litter MUST BE THE 100% PURE CLAY KIND. DO NOT BUY ANYTHIHG THAT IS SCENTED OR THAT HAS CRYSTALS IN IT. Now that you have your supplies, follow these steps.
1. Wipe the ball off with your alcohol or Simple Green. I actually use a 50-50 mixture of alcohol and Simple Green.
2. Cover all the holes with masking tape.
3. Place the ball cup in the bottom of the bucket and place the ball in there with the fingers and thumb facing up.
4. Pour your litter all over the ball and be sure to cover it up completely. Leave nothing uncovered.
5. Let this sit for about 5-7 days at room temperature, undisturbed.
6. At the end of these days, take the ball out and wipe it off again with the alcohol, Simple Green, or both.
7. Have the ball resurfaced either by a person at the pro shop or do it yourself if you have a ball spinner. If you're doing this to a Phenom, I'd follow Rick's advice and take it to 600 grit with some polish.
This all sounds funny, but I've been doing this for years and it really works. In bowling, trust is a must. Trust me. I resurface balls for people at a lower cost than shops here in town since I have a spinner and I've done this for a lot of other people too. They are impressed with the way the ball reacts once I'm done with it. Give it a shot!
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Evolutionary. Revolutionary.