Not sure of the chemical properties, but this type of material has been longed used at Kluge and other European felt manufactures as a stabilizing agent used in felt manufacturing. Pianotek started selling this as "VS Profelt" some years back and it has been a staple with many techs. Its great for resizing key bushings, as was a balancier holes that have become sloppy, as well as key mortices.
For stabilizing key bushing mortices, simply put a few drops on each side, and then put the appropriate caul in place. Leave set over night, and the mortice will size appropriately to the caul dimensions.
For stabilizing key bushing felt after installation, same process, add a few drops to each side, then put the appropriate caul in place and let set over night.
There is an outfit in Germany that currently sells the same product, but at the moment, the name escapes me.
Schaff has announced that it too has come up with a solution similar to the VS Profelt and will be available in the near future.
Tom Servinsky
Registered Piano Technician
Concert Artist Piano Technician
Director/Conductor- Academy Orchestra
Managing Conductor-Treasure Coast Youth Symphony
Keyboardist- Beatles Re-Imagined
Pianist with TLC Jazz Duo
tompiano@tomservinsky.com
772 221 1011 office
772 260 7110 cell