IIRC WD-40 was used to wipe down missiles, and if memory serves it was Convair during the Atlas program. It originally kerosene and a volatile propellant, and recently changed to kerosene and C02 propellant.
It's not the best lube, but it'll serve in a pinch. Being kerosene, it's a little hydroscopic, so it'll attract *some* moisture. I've said it before, but I've used it before a pistol match when I couldn't find the Breakfree, and the world didn't break.
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