The best results I've had are when I coat the gun with Bore Butter and rub a coat of bore butter inside the holster. Don't store it in a damp environment, like the trunk of your car outside. After being outside, in the cold or wet, remove the gun from the holster, and let it assume room temperature (and dry!) before cleaning and storing in the holster inside; many say it's better to store the gun out of the holster indoors. I've hung a Navy in a leather holster on a bed post for months before with no problem. Your mileage may vary.