3 tool black liquid kits fast, inexpensive alternative to black oxide. Imparts a tough, dull black protective finish to ferrous metal parts. Ideal for prototypes, repair parts, and general machine work. The liquid solution is used on small immersible parts. Should be used at room temperature as a cold application. Precision brand tool black liquid kit contains one pint each of tool black liquid, prevent, and metal polish/cleanser. One pint of tool black liquid covers 25 to 38 square feet, however coverage varies with application technique. Tool black products cannot be shipped via air transportation.