Tough, Weather-Resistant HDU Design Board® is a lightweight, high density polyurethane board (HDU). A closed cell structure makes it completely waterproof, allowing for the application of almost any finish. Design Board® can withstand all weather conditions and is ideal for the sign industry.

Design Board® has a very high strength to weight ratio and is an excellent substitute for wood, aluminum, wax, or steel. Design Board® machines easily with conventional woodworking and carving chisels. It is non-corrosive, non-abrasive, and low dust generating when machined. HDU is water-resistant and is not affected by fungus or mildew.

Design Board® can be painted. Depending on the desired result, some surface filling may be required. Spackling pastes are ideal for filling and sanding to achieve an extra smooth finish. Design Board® is compatible with most water-based and solvent-based paints. While polyurethane foam is resistant to most solvents, it is not resistant to chlorinated solvents.