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I just got my tumbler today. I bought a box of walnut hull media from Harbor Freight for $27 dollars (Ouch!), and then a bottle of Mothers Metal Polish (8 oz. for $8). I ran the unit with about 2 oz's of polish for about 10 minutes to circulate the polish. Once I noted that all the balls of polish had disintegrated, I dropped in about 50 pieces of 7MM Rem Mag brass. In 1 hour they came out more shiny than even new ones! Just a little bit of dust on them though. I have an air compressor and I just blew them off and now they are ready to rock & roll! I wonder if the polish will also help delay the tarnish from starting again so quickly? Only time will tell. I have been reloading for a year now and finally getting around to tumbling. I like it!