Epoxy surfboards are laminated with epoxy resin which is stronger and lighter than polyester resin, the resin used most commonly in the surfboard industry. While epoxy boards are known to be better for the environment, they are generally more expensive.
Prior to the closing of polyurethane blank-producing behemoth Clark Foam in 2006, epoxy surfboards made up a tiny portion of the world’s boards and they were infamous for yellowing and difficulties with the repair. But with necessity comes innovation and epoxy surfboards saw a blast of popularity in later years.
Epoxy technology has leaped into the present with a cleaner(less toxic) formula. Also, early epoxy surfboards had a stiffer (less lively) feel to them, but new boards are constructed using different formulas for varying levels of flex.
The basic approach is the same for epoxy surfboards: a foam core wrapped with fiberglass cloth soaked in resin, but new technologies are allowing shapers to experiment with Styrofoam cores and stringer configurations to tweak both strength and flex.