For total recall, use this ready-reference technique

Because I experiment with different glues, stains, and finishes, I can't always remember which products I used on individual projects. So, instead of trusting my memory, I just write all this info, plus the build date, somewhere on the piece in an inconspicuous place. If I need to repair or refinish one of my pieces, I know exactly what the original materials were.
—Bruce Wilhelm, Spring, Texas