... cavity whose shape is more complicated or to make the product with curved face and figured twills.Polyurethane hard ... besides white can be painted. They can be used to decorate the house, salon, hotel, club, etc, ... as follow:1)Light weight, not easy to broken Superior to Gypsum moldings. 2)It can resist decay, ... humidity and mildew, but easy to clean. 3)Labor efficient, It can be planed, ...