Awhile back, I mounted a puzzle with Canvas MountCor, and it worked beautifully. Now, a customer has brought one in covered with clear contact paper, and I'm wondering what to do. I can peel up the contact paper for an inch in, so am guessing that, with care, we might be able to remove it. But what if we get partway in and it's sticking? (Unstik?). It seems like even 130 degrees could affect the contact paper (or it's mild adhesive). And using a cold glue, would the plastic contact paper mess up the drying process? Or the humidity release it? Any thoughts?