Make a slender woodworking file to use for sanding in tight spaces. First, find a paint stir stick. If you don’t have one stored in your garage or shop, you can pick one up at your local home center or paint store. Then cut a piece of sandpaper so that it will wrap around the stir stick once. Use spray adhesive or an all-purpose glue to adhere the sandpaper to the stir stick, and let it dry completely. If you plan to use the woodworking file more than once, use a marker to write the sandpaper grit number on the handle of the stir stick before storing it.
If you’re in a pinch and don’t have the materials to whip up this woodworking file on hand, a simple emery board (also known as a nail file) will work, too.