Flat circle trim is molded in polyurethane, a high-density material that is also lightweight and highly resistant to the effects of moisture. As part of our urethane product selection, flat circle trim will not warp, crack or decay like wood. It is factory-primed and ready for painting and easy installation. Architectural Depot is your source for defining door and window trim. Urethane door and window trim offers both traditional beauty and high-performance in exterior applications. If you are looking for coast-effective and low maintenance alternatives to traditional materials, like wood and stone, our urethane trim products have much to offer.