Add extra rust and element protection to your expensive boat motor with the Mercury Quicksilver Corrosion Guard Engine Protect Rust Inhibitor. This easy-to-use spray can lets you easily add this rust-inhibiting formula to your engine's power heads, under-cowl areas, and inboard and stern drive engines, and other areas. This creates a water-resistant barrier on both painted and non-painted metal areas, and this barrier prevents rust from forming. This formula can also be used to displace moisture to help start wet engines, and it penetrates pre-existing rust to loosen and revive seized parts. Note: Do not spray into air inlets, throttle body, or drive belt systems. Mercury Quicksilver Corrosion Guard can be used on other parts of your boat, on motor vehicles, motorcycles, ATVs, and all kinds of machinery in your life. Quicksilver has been a leading brand in the marine industry for over 65 years. It has earned a loyal following by always providing lab-tested, field-proven, and high-quality products that serve your outdoor lifestyle. 12-oz. spray can. Protects your boat motor and other equipment from rust Ideal on power heads, under-cowl areas, inboard/stern drive engines Creates a water-resistant barrier Works on painted and non-painted metal areas Can be used to help start wet engines Penetrates rust to loosen seized part Works on all kinds of engines/machinery