I have bought some of the new 'arn' stuff which is pretty rough on the inside. I put a wire brush on the end of my engraving lathe and smooth it out - you can do the same thing with a wire brush on a hand held electric drill. There are several different grades of wire brush. Start with a coarse then go to a medium then a fine. for flat surfaces I use "bell" shaped brushes Be sure and wear goggles and gloves --- -- Andie Paysinger & the PENDRAGON Basenjis,Teafer,Cheesy,Singer & Player asenji@earthlink.net So. Calif. USA "In the face of adversity, be patient, in the face of a basenji, be prudent, be canny, be on your guard!" http://home.earthlink.net/~asenji/