A multifunctional topcoat made from hydroxyl-containing resins, weather-resistant pigments, and curing agents, the corrosion-proof paint is suitable for outdoor environments, offering good decoration and protection on metal surfaces. Polyurethane paint is a two-component coating, consisting of the base paint and curing agent, with excellent mechanical properties of the film, good adhesion, and compatible with various primers. The coating has a full sheen and can be tinted to achieve glossy, matte, satin, and flat finishes.