Product Description Modern Masters Metal Effects Rust Activator water-based acidic solution features a timeless oxidized rusty finish on paintable surfaces. Best when used in conjunction with Modern Masters Metal Effects Iron Metallic Paint. Water-based activator reacts with real metal particles in oxidizing paints which expedites the oxidation and aging process, creating a genuine rusty finish. From the Manufacturer This water-based acidic solution is applied over Reactive Iron Metallic Paint. It will react with the real metal particles in the paint, thus speeding up the oxidation process and creating a real weathered rust finish.