Years ago when building a Westsail, I used a black goop specifically manufactured for sealing electrical connections.  It was similar to the tool dip stuff, I think.  Anyway it did come in a small can with a brush attached to the screw-on lid and worked well.  Chad, I'm curious about which dielectric grease you are referring to?  Also, Corrosion Block (I think that's the name) in an aerisol can will kill any corrosion anywhere.  It is non-conductive also.  I spray it in the motor windings of saws and such if they've been left outside.