A half-used sheet of sandpaper looks worth saving, so it goes back into the drawer. A week later, it is hard to remember whether it last touched a clean box side or an old coated lid. Give those sheets separate homes before the drawer becomes a guessing game.
Make two labelled sleeves or shallow trays: bare wood and known finishes. Keep unused sheets apart from both. Within each group, sort by grit and leave the printed backing visible. A small note on the sleeve can identify the finish last sanded; the grit number alone does not tell that story.
Used paper can carry finish residue, dirt or hard little clumps that leave an unexpected scratch on the next piece. Before reusing a sheet, check its abrasive face in good light. Discard paper with stubborn loading, tears or loose grit rather than pressing harder to make it work. Sorting is not a way to rescue worn-out abrasives.
For the last sanding pass on a visible bare-wood face, choose clean paper suited to the wood and the planned finish. Try it on an offcut first. If sanding between finish coats, follow the finish maker’s directions for drying time, abrasive type and grit instead of assuming the bare-wood sanding routine still applies.
Keep the separation at the bench, too: clear away residue and clean the sanding block before changing jobs. Control dust and use the protective equipment appropriate to the material. An old painted crate with an unknown coating is not just another item for the finish-sanding tray; identify the coating and suitable precautions before disturbing it, since older paint may contain lead.
Practical takeaway: label two sleeves today and put a clean sheet aside for the next visible box face. Knowing where an abrasive has been is as useful as knowing its grit.
SandingShop OrganizationWooden Box Repairs