Repairing broken silver ink traces on a mombrane keyboard

[ciccio]

I' trying to repair the keyboard of an industrial controller.
It's one of those keyboard made with domes fitted between two flexible circuits with printed  silver ink cpnductive tracks.
One of the tracks seem interrupted.
Does somebody knows how  to repair the tracks?
I've seen that the adesive is stronger than the ink, so separating the two layers result in broken  tracks ..
Any idea?
Best regards

[Whales]

Conductive epoxy, I've used it for exactly this purpose.  Typically silver bearing.  You only need a tiny amount.

I got mine from eBay.  General cautions:

• mine arrived in the form of syringes + hypodermic needles.  Standard post    Not what I was expecting and probably not safe to post like that.
  
• Difficult to use more than once or twice, epoxy sets in the needle/outlet.

(Next time I'm checking how they send it before buying)

[edpalmer42]

Our cars have copper traces across the rear window to melt ice or frost in the winter.  At the auto parts store you can buy repair kits that consist of a liquid that you use to paint across a gap in one of the traces.  I've used that kit to repair a keyboard where one of the traces just disappeared.