I haven't, but while in Africa this summer I heard of of this one electronics repairman in Zambia who replaced the burnt-out coils of an alternator using copper wire dipped in a lacquer of some kind -- I'm afraid I don't know exactly what it was, but it sounded like something used to seal coats of paint. I could be wrong about this, so don't take too much stock in what I'm saying -- it may be worth an experiment though.