How WD-40 Was Created: The Famous Spray Originally Had a Completely Different Purpose

The ubiquitous WD-40 spray, a staple in garages and toolkits worldwide, has a surprising origin story. Its primary function, as the name suggests – Water Displacement – was born out of a need to protect intercontinental ballistic missiles from rust.

The formula was developed in 1953 by Ivar Norman Lawson for the Rocket Chemical Company, later renamed the WD-40 Company. The 'WD' stands for 'water displacement,' and '40' signifies that it was the 40th successful formula developed. Despite its widespread use and recognizable metal can packaging, the exact composition of WD-40 has never been patented, and its secret formula remains closely guarded, though it is believed to be hydrocarbon-based with a potential small amount of fish oil.

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WD stands for 'water displacement' or, most simply, removing water. The number 40 signifies the formula, meaning the 40th (and successful) attempt to create the formula.

Lawson sold his groundbreaking formula for a mere $500. The initial application for WD-40 was highly specialized: to prevent rust on the Atlas missile. However, its effectiveness quickly led to broader applications. Aviation companies like United and Delta began using it to lubricate parts on their aircraft, such as the DC-8 and Boeing 720, in the 1960s. Farmers also adopted it to maintain their machinery, paving the way for its eventual global success.

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The spray was developed on the idea of an American aircraft and rocket manufacturer Convair to protect the Atlas intercontinental ballistic missiles from rust.