Dulux Trade Undercoat is an economical, high-opacity undercoat suitable for interior and exterior wood or metal surfaces. It offers a high sheen finish, making it ideal for use under high gloss paint finishes. For best results, apply one coat using a brush or roller to a clean, dry surface. This undercoat provides excellent coverage of up to 17m²/L and has excellent flow out of brush marks, providing good build and obliteration. It also retains good cling to sharp edges and dries in 16 hours.