I used to make my own to rebuild code locks in a salt air, humid, hot, blowing sand atmosphere.
I also put them in the freezer to test how they would work in the cold. Did fine.

1/4 tsp WD40
2 tsp lighter fluid
1/2 tsp graphite.
Shake well before each use.

This also words great on regular door locks and handles.
Can be made in larger quantities.
Use a syringe to apply.