Yes they sell Water proof Cell Phone Cell Phone Cases.
From markings and proof marks on the gun barrels and the frame. In some cases you need to remove the barrels, and look on the underside from markings.
Because moisture makes it set hard
Using a salt keeper and putting salt in a moisture proof container servie the same purpose. Both will keep moisture out of salt. There are no benefits to the salt keeper.
prevent moisture from caving into a building
So moisture seep into buildings
you can use a fan or a heat gun.
There are plenty of water proof cases available, but most are brand specific. It depends on what device you have.
Any gun store or major retailer should carry a fire proof gun cabinet. Also you might be able to find one in stock at amazon.com.
A Gun, (:
www.gunproofmarks.ru
Store it in cool area in a moisture-proof container.