The most common resins used in composite surfboards are polyester resins. This is primarily because polyester resin is inexpensive. Additionally, resin manufacturers have perfected their polyester surfboard resins so that they are easy to work with and are crystal clear.
With the advancements in resin technology, it is no surprise composite surfboards are being manufactured with epoxy. Epoxy has no VOC emissions during the manufacturing process, and it has much higher strength, fatigue, and impact resistance properties. However, the only current downside to using epoxy is, these boards tend to turn yellow faster then polyester boards. Although, this may soon change with improved formulations.
Fiberglass is the structural backbone to surfboards. The fiberglass reinforcement provides the structure and strength to the board. Most commonly, lightweight woven fiberglass cloth is used as the reinforcement. Usually, it is between 4 and 8 ounce fabric.
Boards today are embracing composite technology and new materials. The composite surfboards of the future are incorporating fibers such as Kevlar, carbon fiber, and Textalium(Aluminium Fiberglass).
Not only are the materials being used changing, but the method of manufacturing is evolving as well. CNC machines are commonly being used to precisely machine out the foam core. This creates boards that are almost perfectly symmetrical and exact.