I roughed out a thorny locust bowl about 6 weeks ago, soaked for a day in DNA and then put in a brown paper grocery bag to dry per all the instructions I have seen on the web. I checked the weight every few days and when the weight hadn't changed in 3 weeks thought it was safe to turn. I probably left the sides a little narrow when I roughed it out but was able to turn a nice round bowl with about 3/16" sides. Looked really great at this point. I put the sanding pad in the drill, slowed the lathe to it's slowest setting and started to sand. Tried to keep nice light even pressure. After sanding through 180, the bowl was not even close to round anymore. Did the heat from sanding warp the bowl? I tried to bring it back to round with the bowl gouge but ended up with an exploding bowl when one side became too narrow. Any help you can give will be greatly appreciated.