Most of us have a blue-and-yellow can of WD-40 tucked away in a garage or under the kitchen sink, ready to quiet a squeaky hinge or loosen a stubborn bolt. It’s such a familiar household staple that few people ever stop to wonder what the name actually means.
The truth is, WD-40 wasn’t created for homeowners at all. It was born during the Cold War as a high-stakes solution for the aerospace industry. In 1953, a small team at the Rocket Chemical Company in San Diego was tasked with protecting the Atlas Missile from corrosion. Because the missile’s outer skin was extremely thin, even small amounts of moisture posed a serious threat.
Chemist Norm Larsen led the effort to create a formula that could displace water and prevent rust. The team failed thirty-nine times before succeeding on their fortieth attempt. That breakthrough became “WD-40,” short for Water Displacement, 40th formula—a reminder that persistence often matters more than perfection.
