Dear John,  Years ago I purchased a similar product from a local player
piano technician, McCalls Piano Service in Pomona, Calif.  The glue was
called PVC-E and was used in the furniture industry for laminating
"Formica" material to tables.  I visited a factory that used the
product.   They used the product under pressure to secure the pieces
together.

I have found that when the glue is thinned with water to a non-fat milk
consistency, it can be used in some instances for sealing leather
pouches.

Good luck,
Dave Allan