Thought it was a good idea to use fine glass bead abrasive in my rotary tumbler. I had used I kept from blasting some aluminum parts once upon a time. BAD IDEA, I should have known better. Gives a nice dull finish and it's a pain to rid your brass of all the tiny grit. Run my next batch in water with dish liquid, doesn't create a new brass shine but it gets them clean. Not to mention no grit to mess with. Think I will stick with the wash method. Don't know till ya try.