Gelcoat
（重定向自Gel coat）
Gelcoat is a material used to provide a high-quality finish on the visible surface of a fibre-reinforced composite. The most common gelcoats are based on epoxy or unsaturated polyester resin chemistry. Gelcoats are modified resins which are applied to moulds in the liquid state. They are cured to form crosslinked polymers and are subsequently backed with composite polymer matrices, often mixtures of polyester resin and fiberglass or epoxy resin with glass.