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Watermill sandpaper smaller gap between the sand and smaller grind Unqualified Unqualified and water is flowing out, and water so thinner sandpaper dry grinding Unqualified will stay in the gap in the sand of very fine sandpaper surface change from light to reach it this effect and dry sandpaper will not be so troublesome gap between its sand grinding out it is in the process of grinding will fall due to the large gap causes suimo, so it does not need together with water to use. ??That depends on what you want to polish the thickness how slightly, water sandpaper worn slower, but the slower water (the finer the grind the more light sandpaper Koshihikari) dry sandpaper to grind out faster but but coarse (thicker dry sandpaper grinding the faster the more coarse sandpaper slightly with water) If you do not want to wear the number, if you want to wear a lot of words on the first worn away with a dry sandpaper with water sandpaper polished slightly (it also depends on you Do not polished it slightly).