What Does 'WD-40' Stand For?

Does the name of the iconic household product WD-40 reveal something about its invention?
The lubricating spray WD-40 is so named because it was the product of the 40th attempt at creating a water displacing substance.

The Spray Painting Tip That Every DIY'er Should Know

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What's Inside WD-40? Superlube's Secret Sauce

Acts @FACTS The secret formula for WD-40 is stored in a bank vault and has

WD-40 History, Learn the Stories Behind the WD-40 Brand

WD-40 Specialist General Purpose Penetrant 11 oz 1 pk - Ace Hardware

WD-40 - Water Displacement, 40th formula

WD-40 Multi-Use Product protects metal from rust and corrosion, penetrates stuck parts, displaces moisture and lubricates almost anything. The WD-40

8 oz. Original WD-40 Formula, Multi-Purpose Lubricant Spray with Smart Straw

WD-40 - Wikipedia

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The surprisingly interesting history of WD-40

Santie Oil Company WD-40 Multi-Use Product Easy Reach 48/14.4 Ounce Cans

What's Inside WD-40? Know before you spray! – President Trading Online