Restoring a 40+ year old trestle table that my wife's dad made. It's not a piano finish rendition, as it started with construction grade 2X stock, and hadn't had the best of care over the years.
After some planing and a lot of sanding plus a replacement part for one leg, it's finish time. Top was originally fastened to the legs via wood screws through the table top into a 2X4. Redid this to use bolts up through the 2X4 into brass inserts. Then filled the holes with wood glue mixed with sanding dust, sanded flush. It looked good after the first 2 coats of polyurethane, but I decided for a little more gloss to put on a 3rd coat. After it dried, I noticed the filler had shrunk in the screw holes, leaving a slight depression, easy to see and just feel. Why? Fixes? Don't want to start over.
Alexis de Tocqueville was a very smart man.