Xps Cornice is one new kind of cornice material ,It is used more and more widely in the interior room angels where the wall meets the ceiling 
Compared with Plaster Cornice which are heavy, can break easily if mishandled, difficult to install and they are not waterproof and will damage if any moisture gets to the product,the xps polystyrene is lightweight ,flexible,waterproof, anti-flaming ,durable and easy install with Acrylic Cornice Adhesive ,Gone are the days of hammers,nails and blue fingers 
Polystyrene cornices have become the preferred alternative to the plaster and EPS Cornice products,
All polystyrene products can be painted with acrylic or PVA based paints and there is no need for an undercoat or preparation before or after installation