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Water Displacement, 40th formula.

Water displacement is the means by which WD-40 prevents corrosion. 40 is for the 40th attempt by inventor Norm Larsen to effectively formulate a mixture that would achieve that end.

"Water Displacement perfected on the 40th try". Convair, an aerospace contractor, first used WD-40 to protect the outer skin of the Atlas Missile from rust and corrosion. It was originally only an industrial product, and the company was called Rocket Chemical Company. The product made its first appearance on store shelves in San Diego in 1958, 5 years after original development. The company changed it's name from Rocket Chemical to WD-40 in 1969.

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