My father having been a farmer and man with great talents. Through the grace of Jesus Christ giving him that talent. Was working at the farm on that Monday morning when friend named Jim stop by to ask Tom ( my dad) a question if he knew a way to put paint on the heads of hex head screw.Dad says why? Jim said when they put them on the outside of the mobile homes the zinc was great but after a year or two there would a rust streak running down the side of the units. So dad said I'll give it a try so Jim left him a box of screws