Re: Flitz in a case tumbler?????
Gregg: "<span style="font-style: italic">diatomaceous earth,.. used in toothpaste, polishes/waxes, I wouldn't be too surprised to find it's the abrasive ingredient used in JB compound</span>."
It is in JB, at least that's said to be the active part. It's harmless to teeth, paint, plastics and steel because the soft little bitty sea shells it's made from will fracture into a superfine dust quite easily. I suspect it is the working part of many auto polishes too, the light cream colored ones, but I'm not interested enough to find out; who cares, it works!
I have no use for an artifical looking glittery shine on my cases so I just use a couple tablespoonfulls of diatomaceous earth in my tumber media. D.E. leaves my cases with a clean, soft sheen exactly like the factory finish. In fact, I strongly suspect that's what the factories use in their final tumble. With Lumpy's kind permission to use what I like, I will indeed continue to use DE.
Flitz is as good a shiney metal polish as any but more costly than any others I know of, and for no advantage I can see.