The work I do requires a highly polished surface, so I polish the surface up to 12000 (yes you read that right) grit before I start to engrave the horn. When I'm finished I go back over the horn with 3600 grit to knock down the shine a bit and then finish it with a coat of Renaissance Wax (a museum quality microcrystalline wax that protects and does not show fingerprints.) But then, I am not a "normal" horn maker...