Flat trim moulding accents walls, doors, windows, furniture and more. It is easy to work with and can be trimmed and installed like wood. This trim product is traditional in appearance, but molded in modern urethane. At Architectural Depot, we bring you a diverse range of trim products that aid you in creating the beautifully detailed interiors and exteriors that you envision. As with all of our versatile urethane products, flat trim moulding requires low maintenance and performs exceptionally well in both interior and exterior applications. High-density polyurethane is non-porous and highly resistant to the effects of moisture. Urethane trim will not warp, crack, mildew or rot.