Interesting conversation, indeed, and probably way out of my league. But . . . I've coated a number of 2mm glass plates now, 4x5 through 8x10 and subbed with a thin layer of Minwax Polyurethane (spayed on). I've tray processed these plates and have had no lifting whatsoever. If that is of any value.

Prior to learning about the Minwax, I couldn't keep the emulsion on the plates beyond the developer tray.