Smoothing seams and surfaces is easier with a flexible abrasive, and this double-sided sponge file gives you two grits in one handy pad. Its cushioned body flexes to follow flat and curved surfaces alike, sanding evenly where a rigid file would dig in.
Use the coarser side to knock back a seam and the finer side to smooth it off, then rinse the pad and use it again. A bench staple for clean-up work.
