Mercury manual calls for re-covering switch box terminal connections with liquid neoprene. Saw this online 8 oz for $60. Is there a NAPA or hardware store alternative to this maybe available in smaller less expensive sizes that is just as good?
If all you are really trying to do is keep the connections from corroding, you can use near about any type spray paint to cover them as well. Even clear lacquer spray paint will work. JMHO!