I don't know much about dry mounting, but I understand it's a process where you permanently glue the print to the backing board. I like this idea for some reason; it seems guaranteed to keep the print flat, not that it should be a problem with RC paper. I use RC paper; suppose I used 3M spray adhesive to stick my prints to the backing substrate...what would happen? Any ideas how long it would last? I used to use Super 77 to cover fiberglass with cloth and it's very tenacious. Also, 3M has a Spray Mount(tm) product that is specifically for mounting artwork. Anyone used it? Guesses as to how long it lasts or how archival it is?