Back in 66 I was in the Navy and they banned the use of WD40 due to the fact it draws moisture. Spraying unprotected steel with it leaves a coat of rust the next day in a humid environment. Of course, that was 42 years ago. God, I can't believe I have been around that long. I'm certainly not old. I like Diesel myself. Top it with some chain lube to keep it from rusting.