Before the soundboard is glued in, the beams are painted black for the sake of looking good. Why not. This was sprayed black by shop owner. Protect the rim before spraying.
Ellie is off school for summer vacation. She's help us big time in the shop. The glue used here is SK-8 purchased from Mason & Hamlin piano factory in Haverhill, MA. We bought 3 gallons out of their 50 gal container. In order that the soundboard is fastened extremely tight in the piano, dozens of clamps are used side by side all the way around.
24 hours later, the clamps can be removed. There are some gaps around the soundboard. We use WoodEpox colored by powdered pigment to fill the gaps. There is only sanding sealer on the surface for now. The board will be sanded and sprayed with a couple final finish, satin or gloss.