I am mounting a diptych into a two window matte, side by side, so position is important. Each print is about 15x15, so the frame is 21x34. I am hinging the prints (fiber) to the back of the overmatte, using the helpful procedure Mark Rogers (Frame Destination - in fact, his frame this time) suggests on his site. I have done this many times, with the same roll of tape, from Light Impressions, purchased many years ago. The board is 100% rag, like always, and the print dry by several days. It was humid in Richmond today, but the space where I am mounting is air conditioned and doesn't feel humid at all. Everything has been sitting in this room for several days. I have to deliver this to a gallery for a show on Sunday. After the initial tape didn't stick well in one corner (4 pieces, two prints), I pulled them all off (it wasn't difficult - arghh), and retaped, making sure I wet the tape well and stuck them quickly. I left the prints taped to the matte with some weight on top tonight, and will go back tomorrow or Sunday. I have never had this happen. Any suggestions? Sorry for the long winded description, but I don't know what is relevant.