Vaseline works fine for this. You just need a little bit. Back in the
60's my dad had a motel down in GA. Big sign out front must have had a
hundred bulbs or more and the installer reccomended using vaseline on
the bulbs. Never had a stuck bulb or corroded socket. Where I work we
use silicon dielectric grease, again a little dab will do ya. Keeps the
contacts from oxidizing and keeps the bulb and socket from siezing.