Probably A very stupid question. Is it OK to smooth the inside of the vessel as you are building up? It seems that once you get to far into the ring build up it is very difficult to achieve a smooth cut because of the depth and the opening is getting smaller. I do understand you must keep the strength integrety especially in the first few rings. If you are just cutting off the overlap, so to speak, as you go up it does not seem like it would loose any strength. Can you make the cut the final smoothing cut in the bottom half at least so that you don't have to go back and do anything by the time you reach the top?