If you’re considering a fiberglass pool, you may be wondering if you need a liner. The short answer is no. Fiberglass pools are made with a gelcoat, which is a type of resin that’s applied to the mold before the fiberglass is added. This gelcoat finish gives the pool its smooth surface and shiny appearance. It also eliminates the need for a liner, since there’s no exposed raw fiberglass for the water to come into contact with.