I recently bought a used Toyo 45D from someone. After several months of use, the bellows are starting to get pinhole light leaks and some larger ones as well.
I have run the gamut looking for ways to stop them from occurring. I have used gaffers tape, duct tape, electrical tape, a combination of these tapes layering them on top of each other. The tapes just don't seem to stick.
Also I have tried using black fabric paint applied to the inside of the bellows, this seemed to work, but after a few days of use new holes were forming, and the paint stiffened up and started cracking.
I would just replace the bellows but they are screwed into the standards and don't want to attempt major surgery on my camera, and I am not really feeling up for sending upwards of $200.
I knew I could find an answer here, so I am pleading, any suggestions. Currently I am managing by wrapping my camera in a dark cloth before each exposure.