3M has a product called Cold Shrink tubing.  It is designed to seal high 
voltage, etc cables in buried installations.  It is a silicone (?) rubber 
stretched over a collapsable polyethylene core.  You run the cable through the 
core and pull on a tab which unwinds the core and the stretched silicone 
collapses and forms a water tight seal.

I have not used it to seal cables, but have used to replace polyurethane 
coatings on printer platens (Tek TDR thermal printers and HP9100 calculator 
electrostatic printers) that have turned to goo.
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