These coatings are based on carboxyl polyester resins. These coatings are made from the chemical reaction of polyester resin and a very low molecular weight epoxy active baking agent. Due to the good resistance of these coatings to sunlight, this type of coating is used for outdoor projects. It should be noted that these types of coatings have excellent mechanical and chemical properties. As a result, these paints are used to paint aluminum profiles, electrical panels, air conditioners, car parts, and so on. The most important networking agent for polyester coatings is triglyceride isocyanate (TGIC). Due to the fact that these coatings are isocyanate compounds (but blocked and inactive), in polyester paints, another network agent such as primid is also used.