I seem to always have trouble sanding bowls. I tried sanding with the lathe running but it wasnt good.So I have gone to sanding by hand going with grain or the way it appears I need to sand. (I am always hesitant to sand a bowl...ran into the same problem with having sanding marks showing) The wood I have a bunch turned is spalted maple (thats what I think it is..beautiful wood) from my yard that I cut down years ago. I go through a progression of grits but am not satisfied with my results.......sanding marks ,swirls etc. Any suggestions ? Thanks in advance.