Hi, I ordered up a complete set of foam light seals from Mamiya. Besides the bewildering amount of seals included for the back, revolving adaptor and body, most of the foam does not have a self adhesive back. I was told by the tech to pick up some Dap Weldwood glue. Question, how does one go about applying this contact cement? To the foam or camera parts, do you wait for it to dry, or apply it wet??? The 120 back seems to have the worst deterioration. I would appreciate any tips or ideas from anyone who has changed them. Many Thanks, Marco S.