WD-40, known for its versatility, was originally designed to protect missile skins from rust, not for household use. Its name reflects a 40th attempt at a successful formula.
Origins of WD-40
A can of WD-40 is found in almost every garage in France, often wedged between an oil can and a tool box. Few people know that this popular lubricant was not originally intended to grease a squeaky hinge. Its original purpose was more military: to protect the skin of a ballistic missile from rust.Name and Meaning
The name WD-40 stands for "Water Displacement, 40th attempt," named after the 40th formula tested by its inventors in 1953. The formula, created by the Rocket Chemical Company to protect the Atlas missiles of Convair, was never patented in order to remain secret.Development and Invention
The story begins in 1953, in a small laboratory in San Diego, California. The Rocket Chemical Company was founded exactly on September 23, with a team of only three people. Their objective is not trivial; they must develop rust inhibitors capable of withstanding the extreme constraints of military aviation.Paternity and Secrecy
The exact paternity of this formula remains subject to debate. The company and several books credit a certain Norman B. Larsen. However, historian Iris Engstrand from the University of San Diego attributes the invention to Iver Norman Lawson, estimating that the two names have been confused over time. One thing is sure, however, this formula was never patented, a deliberate choice to keep it secret rather than disclose it publicly as required by any patent application.Commercial Success
The journey of WD-40 from the aerospace industry to the shelves of our hardware stores is impressive. What was once a technical solvent reserved for defense engineers has gradually become popular, becoming one of those products we use without even thinking about its origin. And the commercial success is not in doubt, quite the opposite.Financial Performance
WD-40 Company, listed on the Nasdaq under the symbol WDFC, reported solid results for its third fiscal quarter of 2026, with net sales of $195.1 million, an increase of 24% compared to the previous year. Operating income jumped 47% to $40.3 million, and quarterly net profit reached $30.2 million.
