How to cut a crown molding inside corner by Creative Crown

We are the first to manufacture a "molded" polystyrene crown molding in North America! Our crown moldings install with simple painters caulk. No nails or fasteners are needed. Our crown moldings have a patent pending flat-back design that allows it to be cut in most any position in most miter saws. Paint with one coat of water-based paints.
The surface is hard and has a no "bead" look. Visit our website www.creativecrown.com
Wholesale distributors are needed!