Repainting a keyboard matrix

I'd like to move the electronics from one keyboard into another. The
problem is that the matrices are different. They are both the membrane
under rubber dome type. Which means I have to make a new set of mylar
contact sheets. Sheets of mylar are easy enough to come by. The
question is the conductive paint. There are numerous varieties, the
window defroster type, the circuit board repair type and others.

Can someone tell me a brand that will stick to mylar and can take the
repeated pounding that it will undergo on a keyboard.
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