It forms a durable protective coating on steel with excellent anti-corrosive properties. It is formulated for the protection of structural steel and iron, and can be applied over clean or lightly rusted surfaces. It does not require immediate overcoating, but can be overcoated at a later stage if desired. Ongoing protection can be achieved through overcoating or simple recoating with CRC Prime It after 3 years, depending on conditions. Protection in extreme conditions may require re-application more frequently.