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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
WD-40 isn't actually a true lubricant. WD stands for water displacing. The main use for WD-40 is as a solvent and a rust dissolver. The lubricant-like properties of WD-40 are from rapidly evaporating components. It won't last. Firearms-you should never use WD-40 to clean or maintain firearms. 2  It's hygroscopic and will attract moisture to the firearm which will result in rust. 3  Drive chains of any type-because WD-40 isn't a lubricant it really will not work well on Drive chains of any type.