WD-40 was created in 1953 by Norman Larsen, an employee of the newly formed Rocket Chemical Company. It was produced specifically for use in the aerospace industry. The WD in the product's name stands for water displacement, while the 40 was added because it took the fledgling company 40 tries to perfect the formula. Once it did, aerospace contractor Convair was the first to use WD-40, applying it to the outer skin of the Atlas Missile to protect it from rust and corrosion.
A few years later, with employees regularly sneaking the product home for their personal use, the company began selling WD-40 to the public. Then, in 1969, Rocket Chemical Company renamed itself WD-40 Company, Inc. after its sole product. Today, the original WD-40 is still in use, although the company also sells product variations, such as WD-40 BIKE, a product line geared at cycling maintenance.