I currently use successive grits of sandpaper to smooth down the end grain on wood cores for viewing tree rings down to the cell. I use 220, 320, 400, 600, 800, and 1200 grit aluminum oxide sandpaper. The only problem is that the sandpaper clogs up with wood shavings very quickly and even after rubbing with a rubber gum eraser, the sandpaper already feels less smooth. Is there anything wrong with my method or type of sandpaper I use? What brand or type of sandpaper would last the longest and provide the cleanest finish under this situation?