Flat trim moulding accents windows, doors, walls and more. It is unadorned and versatile in its simplicity, whether you are using the trim as a base for onlays or trimming a window with minimal detail. Flat trim moulding is easy to work with and crafted in durable urethane. Urethane has much to offer when it comes to enriching the home. Non-porous urethane resists damage caused by moisture, so it will not warp, mildew, decay or offer a food source to insects. Flat trim moulding can be easily trimmed and worked with. It is pre-primed.