Ralph, pinholes in the bellows can be a real problem! The ideal
solution is to replace the bellows, but a repair will save some cash
and extend the life of the bellows. One way to take care of
pinholes, and also to repair big holes etc, is to get some black
rubber roofing primer ( Snow Roofing Systems Elastoseal - Home Depot)
and paint the inside of the bellows to seal the leaks. Use a foam
brush! A conventional brush will develop little crumbs of rubber
that will come off and stick to the cloth. Let the camera thoroughly
dry with the bellows extended ( several days to a week or so
depending on humidity) so that the bellows do not glue themselves
together. If still tacky, lightly dust with some talcum powder and
vacuum out the excess or give a thin coating of the black rubber finish coat.
The Elastoseal is a water based neoprene emulsion that drys to a
flexible rubber film. Also good for waterproofing darkroom
sinks. They also make a white and black top coats that work in
darkroom sinks.
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