Most people grab a can of WD-40 without giving the name a second thought. It looks like a product code — something technical that probably means nothing outside a factory. But why is WD-40 called WD-40 turns out to have a dead simple answer. WD means Water Displacement. The 40 means a chemist in San Diego named Iver Norman Lawson tried 39 formulas that didn’t work before the 40th one did. Lawson got paid $500 for his trouble — worth roughly $5,000 today. The lab notation went on the can. It’s still there 70 years later.
Three people worked at Rocket Chemical Company in 1953. Three. Norman Larsen, Gordon Dawson and John Gregory had started the company that September in a small San Diego lab. Their job was developing rust-prevention products for the aerospace industry — not household products, not garage staples, just specialized chemical solutions for a very specific industrial problem. Nobody at that company was thinking about squeaky door hinges.
The problem they’d been hired to solve belonged to Convair, an aerospace contractor working on the Atlas missile. America’s Cold War ballistic missile program needed metal components that could survive storage and transport without corroding. Moisture was getting to the metal skin of the Atlas missile and causing rust damage during handling. Convair needed something that could push water off metal surfaces and keep it away long enough to matter.
Lawson started developing formulas. The first didn’t work well enough. Neither did the second. Or the 10th. Or the 30th. Thirty-nine attempts at the same basic problem — a formula that could displace water from metal effectively and leave protection behind — each one falling short in some way. Too slow, not durable enough, wrong viscosity, didn’t work on the specific metals Convair needed it for. The 40th attempt cleared every requirement.
WD-40 stands for Water Displacement, 40th formula — the name straight out of the lab book used by the chemist who developed the product. Nobody at Rocket Chemical Company renamed it before sending it to Convair. The lab shorthand became the product name and Convair became the first commercial customer, using WD-40 to protect the outer skin of the Atlas missile from rust and corrosion.
Here’s where the story takes a turn nobody planned for. Several Convair employees snuck cans of WD-40 out of the plant in their lunchboxes to use at home. That detail — workers quietly taking aerospace chemicals home in their lunch containers — says something specific about how useful the product was. They didn’t ask permission. They just wanted it for their own bolts and tools and hinges. It worked on those too.
Norm Larsen noticed. A few years after Convair started using WD-40 on missiles, Larsen began packaging the formula in aerosol cans that anyone could use without industrial equipment. The product appeared on San Diego store shelves in 1958. Seven people at the company were selling around 45 cases a day out of the trunks of their cars to hardware and sporting goods stores across the San Diego area. By 1969 WD-40 had taken over so completely that Rocket Chemical Company renamed itself the WD-40 Company. The three-person lab from 1953 had become a brand, a company and a product found in workshops on every continent.
Now — why is WD-40 called WD-40 matters for understanding what the product actually does, because a lot of people get this wrong. WD. Water Displacement. That’s the function. Not lubrication. The lubricating effect is real but secondary — it doesn’t last long under sustained load or heat, and anyone using WD-40 as a long-term lubricant for parts under continuous mechanical stress is going to be disappointed eventually.
What WD-40 genuinely does well: getting into corroded bolt threads and pushing out the moisture that lets rust bind metal together. Spray a stuck bolt, wait a few minutes, try again — the success rate goes up considerably. Protecting chrome and unpainted metal from surface rust by keeping moisture off. Quieting squeaky hinges temporarily. Lifting sticky residue — road tar, old sticker adhesive, some contaminants — off painted surfaces when wiped off promptly. Protecting battery terminals and electrical connections from moisture-related corrosion. These all make sense given the name. Water Displacement. The product does what it says.
What it doesn’t replace is proper grease or dedicated lubricant for wheel bearings, brake components, anything that runs hot under load. Those applications need products designed specifically for sustained mechanical work. WD-40 was built for a missile program in 1953, not for a wheel bearing.
The formula inside every can has never been patented. That’s a deliberate decision. Patents require full public disclosure of ingredients and methods — and once a patent expires anyone can legally copy the formula. WD-40 Company keeps it as a trade secret instead, which means the protection lasts permanently rather than for a fixed legal period. The formula was kept as a trade secret and was never patented to avoid public disclosure of the ingredients. Why is WD-40 called WD-40 is a question with a public answer. What’s actually in the can is not.
In 2023 a Reddit post explaining the WD-40 name collected more than 3,500 upvotes. The comments showed two things — genuine surprise that the name was that literal, and widespread assumption that WD-40 was primarily a lubricant. People who had been using it for decades to lubricate things found out the formula was originally built to displace water, not to keep moving parts running smoothly. Both reactions make sense. The name looks technical enough to seem like it means something complicated. Finding out it means Water Displacement, 40th try, lands as almost too simple.
A second Reddit thread cleared up another common assumption — that the 40 referred to a concentration or a product version. It doesn’t. Just a count. Forty attempts. Thirty-nine that didn’t make it. One that did. Iver Norman Lawson got $500. The notation in his lab book became the name on cans in a billion garages.
Why Is WD-40 Called WD-40 — The Key Facts
| Detail | Answer |
|---|---|
| WD meaning | Water Displacement |
| 40 meaning | 40th formulation attempt |
| Formula developer | Iver Norman Lawson |
| Year developed | 1953 |
| Company | Rocket Chemical Company, San Diego |
| Founders | Norman Larsen, Gordon Dawson, John Gregory |
| First commercial use | Atlas missile program, Convair |
| How workers got it home | In their lunchboxes from the Convair plant |
| First retail sale | San Diego stores, 1958 |
| Company renamed | WD-40 Company, 1969 |
| Lawson’s payment | $500 (around $5,000 today) |
| Formula status | Trade secret, never patented |
Frequently Asked Questions
Why is WD-40 called WD-40?
WD stands for Water Displacement — what the formula does to moisture on metal surfaces. The 40 is the number of attempts it took chemist Iver Norman Lawson to get the formula right in 1953. The lab notation became the product name and nobody changed it.
Who invented WD-40?
Iver Norman Lawson, a chemist working at Rocket Chemical Company in San Diego in 1953. He received $500 for developing the formula — roughly $5,000 in today’s money. The company was founded by Norman Larsen, Gordon Dawson and John Gregory that same year with a staff of just three people.
Was WD-40 made for home use?
No. Rocket Chemical Company developed it for Convair’s Atlas missile program — to protect the missile’s outer metal skin from rust during storage and transport. Convair workers started taking cans home in their lunchboxes, discovered it worked on everyday problems, and that informal word-of-mouth opened up the consumer market. Retail sales started in 1958.
Is WD-40 a lubricant?
Not primarily. The name says Water Displacement — that’s the designed function. WD-40 does lubricate but the effect doesn’t last under sustained load or heat. For parts that need long-term lubrication under mechanical stress, dedicated lubricants work better. WD-40 excels at what its name describes.
Why has nobody copied the WD-40 formula?
WD-40 Company never patented it. Patents require full public disclosure of the formula, and once they expire anyone can copy it legally. Keeping it as a trade secret protects it permanently instead. The name is public. The formula isn’t.
When did Rocket Chemical Company become WD-40 Company?
1969 — sixteen years after the formula was developed. By then WD-40 had become so central to the business that the original company name made less sense than naming the company after its most recognized product.
What did Convair workers do with WD-40?
They snuck cans out of the Convair plant in their lunchboxes to use at home — a detail confirmed by WD-40 Company’s own account of the product’s origins. That unofficial field testing on everyday household problems is what revealed the product’s wider usefulness and eventually led to retail packaging.
Iver Norman Lawson tried 39 times. Failed 39 times. Got it right on the 40th attempt and received $500 for his work. His lab notation — WD-40, Water Displacement, 40th formula — ended up on one of the most recognized product cans in the world. Convair workers liked it enough to take it home in their lunchboxes. Seven people sold it from car trunks in San Diego. Now it’s in garages on every continent. Why is WD-40 called WD-40 turns out to be a story about persistence, lunchboxes and a $500 payment that changed more lives than anyone in that small San Diego lab could have imagined in 1953.
Also Read: Ferrari 550 Restomod Veloce12 Aperta Revealed — V12, Manual and 24K Gold Details
