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WD-40 stands for Water Displacement - 40th Attempt.

en.wikipedia.org/wiki/WD-40

WD-40 is the trademark name of a penetrating oil and water-displacing spray. The spray is manufactured by the San Diego, California–based WD-40 Company .

wd40.com/faqs

What does WD-40® stand for? WD-40® literally stands for Water Displacement, 40th formula. That's the name straight out of the lab book used by the chemist ...

wd40.com/cool-stuff/history

But they must have been really good, because the original secret formula for WD- 40® -which stands for Water Displacement perfected on the 40th try—is still in ...

wd40.com/news/in-the-news/so-whats-in-a-name

Jul 16, 2003 ... WD is an abbreviation of “water displacement” and 40 because it was on the 40th attempt, in 1953, that the product was created. And since it's ...

www.wd40company.com/who-we-are/our-history

It took them 40 attempts to get their water displacing formula to work, but on the 40th attempt, they got it right in a big way. WD-40 was born. WD-40 stands for ...

www.snopes.com/business/names/wd40.asp

What does 'WD-40' stand for? ... Claim: The lubricating spray WD-40 is so named because it was the product of the 40th attempt at creating a water displacing ...

home.howstuffworks.com/home-improvement/repair/question155.htm

WD-40 is a must have tool in every toolbox. This substance can help with everything from releasing rusty bolts to lubricating automotive parts.

www.funtrivia.com/askft/Question14826.html

'WD-40 literally stands for Water Displacement, 40th attempt. That's the name straight out of the lab book used by the chemist who developed ...

www.thoughtco.com/wd-40-1992659

Sep 3, 2016 ... If you've ever used WD-40 to oil up something squeaky in your home, you may have wondered, just what does WD-40 stand for? Well ...