I tried Corn Cob material, Walnut shells, sand, lead pellets and ceramic pelets. Most of the media just gave the calls a frosted look, and did not remove scratches. The ceramic worked the best, and I think if I let it tumble for a week or more, it might have worked pretty well. I just dont have the time for that though.
It is still something I wonder about and keep in the back of my mind. I would love to be able to tumble acrylic bodies and get them to come out clear, but for now, the old fassioned way of sanding and polishing works much better.
I mean, think about it, they tumble rocks, and look how they come out? THere is a way, I just have not found it yet.
AL @ THO