QuickSilver Corrosion Guard Rust Inhibitor - Boat Corrosion Guard Rust Inhibitor 802878Q55 - Boat Spray on corrosion guard forms a water resistant barrier on non-painted and painted surfaces to protect from wear and tear. 11 oz spray can Use to prevent rust from forming on out drives, lower units and power trim motors and components or other metal surfaces. Can also be used to prevent further paint damage in areas where undercutting and blistering have occurred. Do not spray on surfaces coated with antifouling or biocide paint. Produced by Mercury marine to our stringent original equipment Manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or mercruiser stern drive