WD-40 (Water Displacement, 40th formula) is an American brand and the trademark of a penetrating oil manufactured by the WD-40 Company based in San Diego, California.[1] Its formula was invented for the Rocket Chemical Company in 1953, before it became the WD-40 Company. WD-40 became available as a commercial product in 1961.[2] It acts as a lubricant, rust preventive, penetrant and moisture displacer. There are specialized products that perform better than WD-40 in many of these uses, but WD-40's flexibility has given it fame as a jack of all trades.[3] It is a successful product to this day, with steady growth in net income from 2021.[4] In 2014, it was inducted into the International Air & Space Hall of Fame at the San Diego Air & Space Museum.[5] WD-40 ; Package Information.