Application: Brush, roller or spray. STIR THOROUGHLY BEFORE USE. Surfaces must be clean, dry, and free from all detective or poorly adhering material, dirt, grease, wax etc. Spot prime all nail heads and metal fixings with 1 coat of an appropriate Dulux Trade metal primer. Any surface defects should be filled with the appropriate Polycell Trade filler. Apply 1 coat of Dulux Trade Quick Dry MDF Primer Undercoat, followed by an appropriate Dulux Trade finish.