Inspect the piano for lifted or split veneer. Inject wood glue with a syringe under any pieces that are loose or cracked.
Cover any damaged areas with wax paper and place a scrap of hardwood lumber over the wax paper to press the damaged veneer back into place.
Clamp the lumber snugly with C-clamps or bar clamps and allow the glue to dry overnight. Remove the clamps, lumber pads and wax paper from repaired areas.
Apply a coat of water-based stripper, using a disposable paintbrush. Work with small sections so that you can scrape off the stripper before it dries.
Allow the recommended working time, then scrape the stripper and old finish from the piano with a nylon scraper. Scrape the used stripper into a covered metal container for disposal.
Spread stripper on a new section, overlapping the first section for adequate coverage. Continue working across the surface of the piano, applying stripper and scraping off the old finish. Work detailed sections with a nylon scrubber to remove the finish. Rinse the surface of the wood with a rag wet with odorless mineral spirits to remove old stripper and any finish residue. Allow the piano to dry to the touch.
Sand the veneer lightly with 220-grit sandpaper, working with the grain. Work by hand or with a sanding block.
Wipe the surface with a tack cloth. Apply two coats of stain and clear finish all-in-one in your choice of color and finish sheen. Work with a soft-bristled paintbrush in line with the grain of the veneer. Start with detailed and hard-to-reach areas first to ensure adequate coverage.
Spread the finish evenly to prevent runs. Allow three hours between coats and 24 hours before returning the piano to normal use.