Ukongeza kwi-photooxidation, ifilimu eyenza i-resin kwi-coating ingathotywa yi-hydrolysis, ngakumbi xa iqondo lokushisa linyuka phantsi kokukhanya kwelanga.Ngaphantsi kwezi meko, iimolekyuli zamanzi ezifunxayo kwi-covalent zinokuhlasela iibhondi ezidibeneyo kwi-resin kwaye ziqhawule amatyathanga e-polymer, okukhokelela kubunzima obuphantsi bemolekyuli.I-polyester kunye ne-alkyd resins zichaphazeleka ngakumbi kule mpembelelo kune-polyurethanes kunye ne-epoxies.