The primary raw materials in polyurethane (PU) coatings are polyols and isocyanates, which react to form the urethane linkages that give the coating its characteristic properties. In addition to these two core components, various additives, diluents, crosslinkers, and catalysts are incorporated to tailor performance for specific application requirements. These supplementary materials can enhance properties such as curing speed, adhesion, flexibility, chemical resistance, weatherability, and surface appearance, enabling PU coatings to be optimized for diverse industries and environments.