It’s New. It Lubricates, Protects and Prevents Rust. When you’ve got a product that works twice as long as the leading spray lubricant … and does more, that’s news. Bull Frog Lubricant & Rust Blacker not only stops things that squeak, loosens things that stick and lubricates things that move … It also prevents it from happening in the first place. Bull Frog Lubricant and Rust Blocker contains metal-seeking VpCls that seal and protect metals with a self-repairing ‘Molecular Umbrella’. This ‘Molecular Umbrella’ seals metals against the air and moisture that cause rust and corrosion.