Application: Brush, roller or spray. STIR THOROUGHLY BEFORE USE. Treat any knots in wood with an appropriate knotting solution. New or bare surfaces: 2 coats of Dulux Trade Quick Dry Wood Primer Undercoat. Previously painted surfaces: 1 coat of Dulux Trade Quick Dry Wood Primer Undercoat. Allow to dry for a minimum of 2 hours between coats, then apply an appropriate Dulux Trade paint system.