Half Corithian Cap Column with Base

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. 4. Pre-primed and ready for paint