Resins are the primary film-forming agents in paints and enamels, providing adhesion, durability, and gloss. The production of resins involves chemical reactions that polymerize specific monomers. Chemical processes such as addition polymerization, condensation polymerization, or copolymerization are used. Initiators (like peroxides) are added to start and control the polymerization reaction. Cross-linking agents and chain transfer agents are added to regulate molecular weight, flexibility, and curing behavior. Decolorizing agents are also used in small quantities in certain resins to reduce/remove the color formed in the production process. There are various types of resins that are produced :