This high-performance three-layer coating system offers superior protection for carbon steel in C5 corrosive environments. It comprises an epoxy primer with zinc phosphate for effective rust inhibition, a MIO-reinforced epoxy intermediate layer for long-term durability, and a polyurethane topcoat that ensures exceptional weathering resistance and color retention. Fully compliant with ISO 12944 C5 standards, the system provides a service life exceeding 25 years on properly prepared steel surfaces. It is ideal for structural steel, tanks, and piping, and recommended for power plants, airports, industrial buildings, refineries, and mining equipment.