I love it. I am not sure about the contact cement. I will see if Bill will weigh in on that. I always use Silicone to stick the backgrounds back to the glass if they come off. One trick of the trade (so to speak) is to smear silicone all over the glass where the foam will cover and let it cure then spray foam over it.... helps it stick a lot better.

I like it. I like the ghost wood tree you made as well