I picked up the 8" Beall wood buff set a few weeks ago and am very happy with the results so far, but I've had issues with one walnut vase. The tripoli wheel has buffed right through the poly finish a couple of times and I've had to sand the piece down and re-coat. I didn't have anything on the finish when I put on the poly - just bare wood. After the 1st time it happened I tried to buff the finish completely off - some spots it eventually came off, but others it just wouldn't come off the wood and buffed to a high sheen. I don't think I was buffing particularly hard, but maybe I had the wheel spinning too fast? Or did I perhaps get an oily fingerprint on the wood before the poly (unlikely, but always possible)?