Originally Posted By: Bebop367
Fluid Film
This.
I have tried most of the dry lubes in the past and none of them work that well or last that long. I live right on the coast and moist, salty air is everywhere. Locks get dry and crunchy in about 2 years. I found that the dry graphite lubes only work on locks that are clean and already in good shape. Dry Teflon based lubes work a little better but the lock gets crunchy and hard to turn again in a matter of weeks.
The thick, rich, wet lube oils really slick the tumblers down and make the locks operate smoothly again. Fluid film works so well because there is nothing in it to evaporate. Once it works its way into the tumblers and around the key core, the lock is basically lubricated for life. Penetrating oils like kroil and gun oils like CLP work very well but do not last as long as fluid film.