My preference is black acrylic paint. it dries w/o tackiness and stays flexible. I paint a thin layer inside and out with the bellows stretched and let it dry that way.
+1 for the acrylic paint. The acrylic paint for fabric stays flexible.
Harbor Freight Tools has it in cans in some stores.
The liquid electrical tape brushes on and is very flexible. It seems to me to be the same material as the dip. I would use it on the outside only it is very shiny when dried.
If you want to try Walmartish snake oil products, hope you've got a spare bellows to test first. Some of these things can outgas and potentially mess with the film, stick to themselves, who knows what. You'd be your own guinea pig. Ordinary black silicone RTV sealant would be better, but with one distinct limitation - once you start with silicone, nothing else will stick but silicone! An industrial supplier like McMaster Carr would have a better choice of these things than a hardware store,
including brushable hi-tech varieties. At least its inert and very temperature resistant once cured. "Liquid electrical tape" would work fine too, at least on the outside. Plasti-dip is also vinyl, so should be on the outside of the bellows only, since vinyl keeps slowly outgassing and could smudge up your groundglass just like
what vinyl dashboards do to the insides of car windshields.
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