I would like some feedback on which tumbler people are using. I see this one at Amazon.
https://www.amazon.com/Frankford-Arsenal-Quick-n-EZ-Case-Tumbler/dp/B01N02YTPJ/ref=pd_sbs_469_1
Looking to do play field parts, metal posts, stainless trim, etc. Are walnut shells the way to go for this? Also, why do some add liquid wax to the media?