Clenzoil® Hinge Pin Jelly Grease will work in freshwater, saltwater... even underwater! This premium grade grease has built-in rust inhibitors that will stop oxidation dead in its tracks. Use it on hinge pins for side-by-side and over and under shotguns. Use it on slide rails, bolts, receiver rails, axles, etc. Clenzoil® HPJ Grease can be used on any load bearing surface or friction point where heavier grease is needed. This 100% synthetic grease is the world’s best choke tube lube!