Flat trim moulding is crafted in durable urethane. If you are looking for low-maintenance, high-performance trim, urethane has much to offer. It is an excellent medium for the crafting of trim that maintains a traditional material while resisting the warping, cracking and decay. Flat trim moulding is a basic addition to enhancement projects ranging from simple window casings to boldly detailed mouldings. The non-porous qualities of urethane provide protection against warping, cracking and decay. Urethane mouldings are rigid and dense, but also lightweight and easy to work with. They are pre-primed and they hold paint well.