I recently bought a Dremel 200 series and a polishing kit, and i was wanting to test it out on a cheap Colt knife, which has a black blade on it. It was very scratched up and beat on so i got out one of the tips and took all the black off the blade and I tried polishing that. I got a decent looking finish but i can't seem to get the mirror finish I am looking for. Does anyone have any experiance in this? Thanks in advance.