Large Flexible Chairail 3 3/16" x 1 1/8" thick, in flexible polyurethane. Although yellowish in color, it accepts primer and paint the same way as MDF does. Perfect for curved staircases, curved walls, arched windows or arched openings. When installed next to our LCR trim and painted forms a seamless joint. To save on costs, maximize the use of the rigid MDF profile and use the polyurethane equivalent only for the curved portion of the project. Most popular for making Applique wainscoting as a wall treatment. This trim can also be used as a stand alone trim.