Coral Keystone 12" #612

12"H x 12"W x 2"D Shown in our Custom Stone White Finish Our polyurethane products may be cut, nailed, and basically installed the same way as any wood molding. A polyurethane adhesive should be beaded along the touching edges of the wall/ceiling and between joints, and then a few small nails to hold in place while the adhesive sets. Advantages of Polyurethane: 1. Interior and exterior use. 2. Waterproof: they won't absorb moisture or mildew 3. Lightweight and easy to install.