Most of us have a blue-and-yellow can of WD-40 tucked away in a garage or under the kitchen sink, ready to silence a squeaky hinge or free a rusted bolt. It is one of those household staples so familiar that we rarely stop to question what the letters and numbers actually mean. For decades, the name was just a brand, but the true story behind it is far more interesting than a simple marketing choice. It turns out that WD-40 wasn’t designed for homeowners at all; it was a high-stakes solution born from Cold War engineering and the grueling reality of scientific trial and error.
In 1953, a small team at the Rocket Chemical Company in San Diego was tasked with a critical mission for the aerospace industry. They needed to develop a line of rust-prevention solvents and degreasers for use in the aerospace sector, specifically to protect the Atlas Missile from corrosion. Because the outer skin of these missiles was incredibly thin and susceptible to rust while sitting in their silos, moisture was a primary threat to national defense. Chemist Norm Larsen led the effort to create a formula that could effectively create a barrier against water, a task that proved much harder than the team initially anticipated.
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