Water helps keep the coverstock particles from flooding the air you breathe, always a safe bet to reduce beathing in this stuff. I'm sure husky was just saying that green Scotch-Brite is considered to be 600 grit; I assume he was not necessarily telling you to use it. It is more convenient to use than silicon-carbide wet/dry sandpaper. If you are used to sandpaper, it makes little difference to the ball. Use what's easiest and what you're most familiar with. Learn both, eventually, for your own experience and knowledge.
Personally, I am surprised that the EC had a stock 600 grit finish, given its reputation for very easy length. 600 grit is very dull in this day and age.
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"Those who do not remember history are doomed to repeat it."
