I have had a few firearms that only come out a few times a decade. They get lubed before use and after they get cleaned and oiled and greased to manufactures directions (or as close as possible with the 100 year old ones, whale oil isn't as common now) they are then placed in a silicone sock and stored in a safe with a golden rod, inside the basement where the temperature does not fluctuate much. Never had an issue. Of course this is before the boating accident.