Working on a DIY vibratory polisher. After reading many threads and posts I think I have a design for my unit. The only remaining question for me is what to use for a lining for the tank? My tank is going to be formed/welded steel 1/8" steel. I have seen references to some sort of lining but not a clear idea of what to put in and where to get it? Any ideas?

Also when completed I need to polish machined steel parts. An suggestions on the type of media needed?