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.

History - WD-40 Company

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WD-40 - Wikipedia

Vintage Reproduction Poster WD 40 1964 Real Ad

People are only just realising what WD40 stands for and it's blowing their minds

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

34 WD-40 Hacks You Can Use at Home

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How to Protect and Extend Automotive Chain Life With WD-40 Specialist Anti-Fling Chain Lube

Spray wd40 Mountain Bike Reviews Forum

WD-40 Original WD-40 Formula, Multi-Purpose Lubricant 8-fl oz Spray with Smart Straw, Convenient Twin Pack in the Hardware Lubricants department at