Standard sandpaper with a block works better. Nice to hold but I only get one side of the door before I have to switch to the other. They dry for several hours. An 80 grit sponge will turn into a 150 grit sponge after two or three uses. I wouldn't buy 180 or more because 80, 100, 120, 150 grit quickly becomes 220. Great idea, but not for me.
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