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Though poly won't last as long for some applications it's what you want. It will breakdown and become finer and finer as you use it.

Since this thread is slowing let me put a spark in it.

Have any of you tried Zirconium oxide?

Cerium is at the top of the heap in lapidary circles for polishing hard stones. Usually, it's used in a vibrating lap which is basically a tray with a felt pad and it sits on a motor that vibrates...