Step 6: Clean Off Grout And Seal Tabletop
After an overnight set, the tabletop is cleaned with first, a damp sponge, and then polished with a dry cloth, such as a micro-fiber cloth. When cleaned up to your satisfaction, the table is then sealed with a grout sealer. I believe this isn't entirely necessary, but can't hurt and will protect the joints somewhat from soil and discoloration. I think any polyurethane varnish can accomplish the same thing, especially for art pieces.