Wet sanding is done for a couple of reasons.... First being that it allows your paper to last longer. When you sand with really high grits (600 or higher), the paper tends to stick to the sandlings making this nice layer of poop on your paper and rendering it useless. The soap is added for a little lubrication, so that you slide easier. The second reason is that the water tends to create a sort of suction between the sanding block and the panel making for a flatter smoother surface.
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MeltMan
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