According to the working nature and conditions of engineering machinery products, the material and film used should have strong adhesion, high mechanical strength, excellent wear resistance and corrosion resistance. It is generally achieved by combining epoxy primer with polyurethane topcoat to form a composite protective coating. Based on the characteristics of the industry, Meidong Biotechnology has developed amine based curing agents that combine fast drying, mechanical properties, and salt spray properties. These agents are developed in conjunction with coating customers to adapt to different production line conditions and provide protection for various types of mechanical equipment.