crown molding 4" height 94-1/2" length manufactured with dense architectural polyurethane compound (6 moldings) dreamwalldecor <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