After curing, unsaturated polyester resin will undergo aging during use, characterized by yellowing of color, loss of surface gloss, brittleness and even cracking, and a decrease in mechanical and other physical and chemical properties. There are many factors that can cause resin aging, mainly external conditions such as temperature, pressure, ultraviolet light, oxygen or ozone, water, chemicals, etc.

After not drinking and curing with polyester resin, long-term aging occurs under sunlight exposure. The main reason for photoaging is that the material absorbs light energy, causing the covalent bonds of molecules to break, and the presence of impurities causes defects in the resin material, making it more prone to aging. The following focuses on analyzing the aging effects caused by the effects of ultraviolet light, oxygen and ozone in the air, and water degradation, and proposes measures to prevent aging.