Gel coat resin is a special resin for making the gel coat layer of glass fiber reinforced plastic products. It is a unique type of unsaturated polyester. It is mainly used as the surface layer of resin products. It is continuous covering thin layer chromatography. It is generally around 0.4mm.

The effect of the gel coat resin on the surface of the product is to give a protective layer to the matrix resin or laminated raw materials to improve the weather resistance, corrosion resistance, abrasion resistance and other characteristics of the product and give the product a bright and beautiful appearance.

Gel coat resin is divided into primary color gel coat and colorful gel coat. In the process of product processing, colorful gel coats must be applied in most situations. In the past, colorful gel coats were made by adding an appropriate amount of paint color paste (also known as color paste) to the original color gel coat by artificially adjusting the color, but the color glue formulated in this way is used in large and medium-sized assembly products such as cooling towers or mass production. Products such as sports venues can often cause color difference during the processing of certain products such as chairs on the table, which seriously affects the beauty of the product. Therefore, one of the development trends in this field is to improve the appearance quality of products and produce colorful gel coats with no color difference for customers.

Ordinary resin generally refers to the category of softening or melting after heating. When it becomes soft, it has a fluidity tendency under the action of external force. It is solid, semi-solid, and sometimes liquid organic chemical polymers. In theory, all high-molecular material chemicals that can be used as raw materials for the production and processing of plastic products are called resins.