>> conductive carbon coating

There's this stuff: http://www.thinkgeek.com/product/b70c/  (lots of people=
 carry it.  I don't know how suitable it is for keypad switches, but I also=
 haven't heard a lot of bad things about it.)

Ordinary lubricant-grade "graphite" is pretty conductive, and could potenti=
ally be mixed with any number of potential binders; I'm not sure what would=
 stick well to PCB pads.  (This is much less messy than "conductive lampbla=
ck" or "conductive carbon black"; probably not quite as conductive, though.=
)

BillW


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