How much are you getting it for? I say if you want to get a ball, for a good price, and want to change the surface and try something new, what is it going to hurt?
If the price is right, go for it, if the 4000 and polish doesn't work, you can always take the polish off and do something else. If the price is really high, I wouldn't...
Just my opinion....
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Formerly SGC300
"Never get into a pissing match with a skunk, cuz he'll piss all over you and like it."-Keyshawn Johnson on Terrell Owens