<b>Crown molding</b> is manufactured with a dense <b>architectural polyurethane compound</b> (not Styrofoam) that allows it to be semi-flexible and 100% waterproof. <br /> This molding is delivered pre-primed for paint. <br /> It is installed with architectural adhesive and/or finish nails. <br /> It can also be finished with caulk, spackle and your choice of paint, just like wood or MDF. <br /> <br /> A major advantage of polyurethane is that it will not expand, constrict or warp over time with changes in temperature or humidity. <br /> It is safe to install in rooms with the presence of moisture like bathrooms and kitchens. <br /> This product will never rot. <br /> Safe to install indoors or outdoors <br /> Will not absorb moisture <br /> Is lightweight and durable against average wear <br /> <br /> <b>Recommended tools for installation</b> <br /> <br />- Nailgun & air compressor (set at 100 PSI or less) <br />- Miter saw <br />- Adhesive <br />- Spackle <br />- Caulk <br />- Tape measure Laser level