Yes, you can repair these heating "wires" with silver-loaded paint. Normally available at Radio Shack (does Radio Shack still exist?)

It's very difficult to make a neat job of it though.

If I was trying it again, I would try painting the stuff on between 2 strips of masking tape.

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Paul Gibbons
'93 320CE
'73 Jensen Interceptor (Resting)
Giant Full Sus Mountain Bike