Marine grease has a tough job. Not only does it have to lubricate and protect bearings and other parts, it must withstand extreme moisture conditions, extreme to the point of being submerged in water. While marine grease and “regular” grease both have the same job, without special formulation that makes marine grease work, regular grease would simply wash out of parts leaving them unprotected and in danger of failure.
Marine grease is typically formulated with tackifiers that give it an affinity for the surface or make it more “surface active.” Basically, it makes grease stick better. Marine grease also contains additives such as corrosion inhibitors for both ferrous and non-ferrous metals to protect against rust, corrosion and pitting. A proper marine grease should have passed ASTM D1264 water washout testing. As a rule, marine grease should be used in any marine application including trailer wheel bearings, steering assemblies or any other parts that require grease.