The Mystery Behind the Blue-and-Yellow Can: The Story of WD-40

WD-40 is a familiar product in many homes, commonly used to loosen stuck parts or stop squeaks. While most people recognize the name, few know it began as a specialized chemical created for military use rather than everyday repairs.

In 1953, scientists at the Rocket Chemical Company in San Diego were working on a solution to protect Atlas missiles from rust. The missile casings were extremely thin and vulnerable to moisture while stored, making corrosion a serious risk. Chemist Norm Larsen led the project, which focused on developing a compound that could repel water and prevent metal damage.

The name WD-40 stands for “Water Displacement, 40th formula.” It reflects the fact that the first 39 attempts failed to meet the necessary standards before the team finally achieved a working solution on their fortieth try.

Originally intended for aerospace protection, the product gained wider attention when employees began taking it home to use on household problems. The company soon recognized its commercial potential and released it for public sale.

Today, WD-40 is used for a wide range of everyday tasks, from freeing rusted bolts to cleaning tools. Its name serves as a reminder that the product’s success came only after repeated failure and persistent experimentation.