2pcs Jakehoe Rust Conversion Primer Iron Door Metal Gear Bracket Rust Stair Handrail Corrosion Remover Our Rust Conversion Primer contain citric acid， epoxy resin and zinc powder. It can form a thin coating on the surface that can resist climate change， can be exposed to the outdoors for a long time， and can quickly and effectively convert rust into a protective coating for a stronger， more durable surface. The way to use it is simple: clean the surface， ensure that there are no dust particles on the surface， apply the product on the surface， and leave it for eight hours before applying the topcoat. Easy to apply and quick to dry， so you don't have to wait for long drying times to get back to work quickly.