I am with Glenn on the dislike of WD-40. At a machine shop I worked at I was always told stay away from WD-40 for any mild steel that will be sitting a long time. They were right, against my judgements of staying away for many years I sprayed down a 350 block I had on hold for a future day. It was a last minute thing and it was all I had. It sat for a year in a garbage bag in the garage. I opened it a few weeks ago and it is total crap. Solid rust, it couldnt have rusted more if I had just layed it outside the whole time. I had it hauled to the dump a few days ago.