The product soon found an important industrial use during the Cold War. Aerospace contractor Convair used it to protect the outer skin of the Atlas missile by displacing moisture and creating a protective barrier against oxidation and environmental damage.
Employees eventually realized the same formula was useful outside aerospace work. They began using it at home on tools, hinges, bicycle chains, stuck bolts, and other mechanical parts, helping the product gain popularity through everyday practical use.
WD-40 later became a household staple because of its ability to repel moisture, loosen rusted parts, provide light lubrication, and protect metal surfaces. Its history shows how a product originally created for aerospace engineering became one of the most recognizable maintenance tools in the world.
