I have a large tupperware that fits over my tumbler to help control the dust and keep the noise down. It makes walnut litter usable, I have heard that dryer sheets work also
Stainless seems to be the best but requires either an outlay or money or work, both for some people.
I hate the green stuff. Seems to clump and get stuck in everything.
Very true, however try putting the liquid in for about 20 min. max and tumble will most likely stop that from happening. Then add your brass.