I'm wondering if any of you guys have any experience with the 18 lbs. metal tumbler sold at Harbor Freight. I picked one up along with 10 lbs. of the green resin media that they sell a couple days ago. I set it up put the 10 lbs. of media in it, put my striped BK2 in it around 5pm. I came out the next morning to check on it. It did not look any different then when I put it in. Along with my BK2 I also dropped a small piece of O1 tool steel that I had laying around. The O1 had many rust spots on it. The O1 did come out a little cleaner but still had visible rust on it. The tumbler gets good reviews and i have watched many you tube videos on it. One video I watched a guy dumped a bunch of rusty bolts in it with the grean media (same stuff I used) and the bolts all come out rust free. I picked up 10 lbs. of the grey media that Harbor Freight sells yesterday but am a little skeptical about using it. I'm just wondering if anyone has used one and if I'm doing something wrong? Should I be using more media? All help is much appreciated.