I think that urethane balls are solid and do not have many pores. Compared to a reactive resin ball, is urethane with pores, that was created by an additive. I would imagine that urethane balls will probably soak up very little oil, since they have few, if any pores. Thus I would doubt that either of those systems would work, unless there is something more going on then I know about.
I once put an old solid urethane ball in my rejuvinator for several cycles, and no oil at all came out. Not that it was too surprising.
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dR3w
Dynothane by choice
"Gunga, galunga, ... gunga, gunga-galunga"
"Sea monkey has my money ... yes I'm a natural blue"
"I did nothing. I did absolutely nothing, and it was everything I thought it could be. "
"Too early for flapjacks?"
