Regarding greases for outdoor connections: Noalox for general use (not necessarily for aluminum)? Dielectric grease for outdoor receptacles?
I have used dielectric grease for years in so many applications. For mains voltages is is primarily a non-conductive corrosion barrier. In that sense, any non-conductive grease will do. Electrically, the original metal-to-metal connection is maintained because corrosion is reduced. You can use it liberally around connection points because it does not conduct.
Noalox sems to contain zinc dust in a plastic grease matrix. I'm not sure how conductive it may be at mains voltages, but I would apply it only at the specific connections.