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This sandpaper storage system is about as simple as it gets. It’s just a stack of folded envelopes bound with a big rubber band. Each envelope is marked with a grit number. A thin piece of wood on the bottom of the pile keeps the envelopes flat.
Standard letter-size envelopes work well. Fold and tape them to fit your sandpaper. My pieces are 1/6 of a sheet, a perfect size for a sanding block. To make them, I tear a sheet in half lengthwise, then divide each half into three pieces. –Tom Caspar
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