Wd-40 protection spray WD-40 is a mixture of chemical concentrates suspended in a high grade petroleum distillate. Will not affect fabrics, rubbers or plastics. Its working temperature is between minus 100º F to plus 300 degrees F. WD-40 is an all purpose liquid for displacing moisture corrosion control, lubrication, cleaning and penetration. WD-40 has the ability to penetrate the minute grain boundaries on all metals, although not essentially a lubricant, WD-40 is regularly used to lubricate all light machinery and electrical equipment. Thoroughly recommended to clean, preserve and protect all tools.