We just ruined an 18 x 18 color Fuji semi-matte photograph by permanently mounting it to acrylic with standard dry mount film. It looks great right out of the press, then over 2-3 minutes, large blisters appear at random locations. Does anyone have ideas on how to solve this? A small sample with Kodak paper worked great. I am not the framer (it is my photograph), but I have a lot of experience with engineering industrial processes and know how subtle the causes of defects can be.