well at least for rust prevention. Back when I was a kid in the 60's people used WD-40 on elbows and knees and shoulders that hurt. I always thought this was the dumbest thing I had ever heard until recently , I was told the original formula contained DMSO as a solvent...this was the rage in the late 70's and early 80's for sprains and injuries ....until it was discovered how bad for your liver it is.
PS if you have any firearms never use WD-40 on them...it displaces water and lubricants
http://img.ifcdn.com/images/1313ad9503d897357c0bafe2d0b6edabe329474c480fd8b016 c0000c68d25212_1.jpg