Seal and prepare wood and MDF with Crown Wood and MDF Primer and Undercoat White for interior and exterior use. Offering complete coverage, this water-based primer and undercoat can be used both inside and outside the home to provide a protective base coat to ensure smooth and even paint coverage on wood, chipboard, hardboard, MDF and plywood. Suitable for use with water-based and solvent-based paints, this advanced two-in-one formula has everything you need in one can so you can achieve a professional finish.