[ Gary Siebring wrote in 170116 MMDigest: ]

> I seen a advertisement for clear Flex Seal Liquid Rubber Coating
> and it fixes all leaks and is clear and very flexible it said.

I presume that "Flex-Seal" is being discussed here.  It comes in a
paint-on version, along with the spray.  (I recently saw both versions
at "Lowe's".  I'd recommend trying painting some on the outside of
bellows (not spraying into their insides, where it would glue down flap
valves), and then maybe applying talc, if it stays sticky, even after
"curing".

Gordon Stelter