Flat trim moulding becomes a defining addition to simple door and window casings and a complimentary addition to larger enhancements. Flat trim moulding addresses decorative improvements both inside and out. Urethane is exceptionally durable and can withstand the natural elements, making it perfect for exterior applications. Flat trim moulding is non-porous. It locks out the moisture that causes warping, cracking and decay. Non-porous urethane products also hold paint well due to low moisture absorption. Flat trim moulding is pre-primed and ready for finishing.