Very good comment. I was at General Dynamics Astronautics in San Diego when WD-40 came to be. GD bought it in barrels to use on the spot weld joints of the Atlas. The stainless steel balloon, which was the inflated body of the missile, would rust where it had been spot or roll welded. Even more serious in the upper stage Centaur.

WD-40 wasn't the 40th try, it was just a good name. I am pretty sure that WD-40 is over 90% kerosene and or naptha.

Anyone wonder why the company, which was across the street from GD Astro, was "Rocket Chemical Company"?

One more memory. In those days we bought new homes before they were built and they had no lawn or fences. The neighbors got together and built redwood fences. I did a simple test . . . I sprayed some ordinary nails, driven into a fence post, with WD-40. A week later they were rusted.