It wasn't actually today, but I recently repaired the bellows on my Polaroid Land Camera 100. There were some pinhole leaks along the creases and corners, which I patched using liquid electrical tape. It took several coatings before some of the pinholes disappeared when examined using a flashlight on the outside. I also used some flexible rubber cement to adhere part of the vinyl (?) external covering on the underside of the bellows.

Even after opening and closing the camera several times, the repairs seem to be holding! I've now got a perfectly functional instant camera.