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Let's hope that they are not urethane rubber.  Some urethanes react with the moisture in the air to break down the long-chain polymers that give the rubber its strength.  The rubber turns to the consistency of a gumdrop.  Polyester-based thermoplastic polyurethanes are more subject to this problem that polyether-based varieties.

 

This urethane "hydrolysis" is a common problem in the music recording industry.  We see rubber idler wheels turn to goo, and the binder that holds the magnetic particles onto magnetic tape becomes sticky.  The tapes must be baked for anywhere from a day to a month to reverse the process long enough to allow the tapes to run through a tape recorder without totally gumming up the tape guides and stalling the tape.

 

I have not heard of any solvent that improves the situation.

 

Paul, is your CAB2 stored in a high-humidity location?

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