Beautiful new HDU Neighborhood Entrance sign for the Providence Neighborhood. High–Density Urethane (HDU) is a strong, naturally waterproof material made for creating dimensional signs. HDU signs have a carved look, and they feature smooth or textured backgrounds. Sandblasting and routing are both viable methods of shaping your perfect sign. #betterfromthetop #hdu #entrancesign #neighborhoodsigns #handpainted #routedhdu #customsigns #signs #signshop