I have a pair of rather nice looking Kodak Art Deco folders. As to be expected the bellows are full of pin holes on the corners. What I was thinking for a repair was to sacrifice a dark bag for its light tight material, and glue a strip of the dark bag down each corner using a mixture of wood glue and matte black artists paint. I don't think the usual pinhole fix like liquid electrical and black paint will do the job. Ideas and advice welcome.