From the last post:This is a five peice double bowl of Red Dalmation Wood. Size 19 inches tall by 9 inches in dia. Rough turned, boiled several hours, air dried about 5-6 weeks in the open shop to about 20 % MC and then into the kiln to below 5%. Finish turned and finished with high gloss floor polyurethane. A couple weeks later wet sanded with 1000, water and soap and buffed with a cotton rag and car buffing compound.
Maybe you are not waiting long enough after applying the last coat of finish before wet sanding and buffing. I wait a couple of weeks so the finish gets to its maximum hardness.