Quote Originally Posted by bdial View Post
One view of "archival" is that it should be reversable. Using that definition, neither the spray adhesive nor dry mount tissue are archival.
Either way, the print can only last as long as the mount does, and if the mount is damaged, it cannot be replaced without severe risk to the print.
This is the accepted view. I guess I've been using 3M Spray mount for well over 30 years, for commercial applications. The prints were never needed to last more than a year or two, most are just as good now as when produced,and very few have come apart.

If you need archival prints then Spray mount isn't the solution, but if you want a good quick method of mounting RC prints then it's excellent.