Hey, looking for some opinions. Would polishing a urethane solid ball be the same as polishing a solid sanded ball? How would the urethane take to the polish. Was thinking about getting a urethane, maybe the hammer black, or storm pitch (insert color), or a 900 global boo yah, but liked my old storm super natural. Bowl on wood with overlays, and would like the heavy sanded ball to go farther down lane, also so I can square up a bit.

Thanks for the input

Polishing a reactive resin ball will delay the hook in the oil and can cause a more dramatic reaction when the ball sees the dry.  More skid/snap as compared to the previous surface.

Polishing a regular urethane will generally delay all aspects of hook for the ball.

Totally agree charlest, I unfortunately made my response too generic and thus did not give exact info.

I kinda figured on the delayed reaction/reduced reaction. Thanks for the info on how hard it is to polish. I wondered how well urethane would polish up. In the case of the hammer black, 500 sanded oob, could I just polish over that, to reduce reaction, but keep "teeth" under the polish? How much can I polish before it goes " straight" on me, I.e. I loose all hook

You could use polish over 500 grit but a LOT of teeth would still stay. I suggest using abrasive grits (not skipping any) until you get the reaction you like. If, at 4000 grit, it's till too early, then I would try polish. As I said, true urethane is very stiif, inflexible, not hard. It will seem like it's hard, but that's not a true measure.

As for how far you can go, it's too hard to say, for me, as there are too many variables. Certainly the more speed dominant you are, the rougher the surface you need to get a good reaction; the rev dominant you are, the finer, or the smoother the surface you need.  The amount of oil and the length of the oil also come into play. Your release affects it also: if you have more tilt than average and/or if you have more rotation than average, you will get more natural length and more backend, than average.

I started out by sanding plastic & urethane balls and I wouldn't say Urethane's are "VERY" hard to sand, they just take a little extra sanding time.

Resin balls are soft and sand real fast, Urethane's typically have a harder coverstock, that's why they take a little longer to sand.

yes If your going for a smooth, shiny surface then stepping through the grits is best.

Pretty much any sanding technique you can use on a resin ball, will work on a urethane ball.