Flat trim moulding details, doors, entryways, windows, walls, and more. Its basic design provides versatility as applied to a world or decorative enhancements. Flat trim moulding offers an excellent, modern alternative to wood millwork. When you require high-performance products that require little maintenance through the years, urethane millwork offers beautiful and cost-effective solutions. Our urethane products are perfect for use in both interior and exterior applications. Flat trim moulding is precision molded in rigid, high-density polyurethane. Urethane moulding is pre-primed and ready for finishing. It is lightweight and easy to trim and install.