Somebody explain this one to me. The balls are impacting each other harder on the majority of the shots we shoot in a pool game than they ever are in a bucket polisher. And sometimes in games we are even shooting shots that result in impacts that are orders of magnitude more violent than anything that ever happens in a polisher, like break shots, massive stroke shots, pounding a nearly straight in shot to float the cue ball as far down the tangent line as possible for shape, jump shots, etc.
If these "impact marks" are actual tiny surface cracks of some sort in the phenolic, which is the way it seems to get described and what the term "impact marks" would suggest, then why is it none or almost none of these much more violent ball impacts in a pool game are causing impact marks, but balls rattling together in a polisher would be causing them?
The only explanation I can think of, but it doesn't seem likely, is that the balls are allowed to get too hot in the polisher which weakens the surface of the phenolic while hot making it more brittle while hot for lack of a better term. I've never really heard of anybody saying the balls were getting real hot though and I don't think just mildly warm could possibly be a problem.
Anyway, I'm having trouble understanding how less severe impacts would cause damage when the balls are in a ball polisher, but more severe impacts will not cause damage when balls are on a pool table.