blank foams in traditional PU are harder and harder to get due to their non environmental issues. Although still used by many shapers, new materials such as the Extruded Polysterene XPS are starting to become a very reliable material. Expanded polysterene EPS is another good choice. The trick is to get a good offer for the epoxy resin that doesn't increase your costs of making the boards too expensive. We can provide you very good foams with high resistance, lightweight and with excellent waterproof characteristics.(email removed please read forum rules re self promotion and advertising)if you want to know more information.