John, thanks. Plak mounting sounds like an updated version of the decoupage print mounting that was popular (with my family anyway) back in the '70s and '80s. We would use a spray adhesive to mount a photo on a painted or decorated piece of MDF or hardwood, and then coat it with the decoupage glue or varnish. The decoupage medium yellows over time. The laminate used with plak mounting may withstand aging a bit better.