After a good whetting, a gun needs open air. Allow the moisture to dry off before storage, or cleaning.
I know how hard it can be to dry off a gun after a day in the field, especially if your spending several days out, and I seem to almost always get wet during elk season or late deer.
AMEN! Never store any gun in a case or holster; if anything use a GUNSOCK (silicone impregnated) and store it in a safe or with a trigger lock in a safe location.
Leaving a wet gun in a case is like expecting your wet laundry to dry in a plastic bag and leaving any gun in a case or holster invites condensation and then...RUST.