I went to Radio Shack reluctantly expecting to pay the $22 for the Craig Circuit Writer conductive pen, but alas, my Radio Shack no longer carried them and on the shelf I noticed a "Bare Paint" conductive paint pen for $9.95. Its acrylic based (not waterproof) and is thick like artist paint (it uses graphite as the conductive material). I applied it with a tooth pick to repair a Mitsumi 800 keyboard and it works pretty good. Best to have a blow dryer on LOW to speed up curing. It gets more conductive as it dries. It also has a resistance and sometimes it doesn't show continuity on my multiplier, but it will still do the job (its intended for DC voltages <= 12 VDC). If you put it on thick, it will dry hard (i.e. brittle) and may not be a good idea to put directly on the mylar pad contact point where the plastic plunger consistently hits. All I needed to do was re-trace the terminal points where the mylar contacts the circuit board and repair one trace.
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