Farrow & Ball Wood Primer & Undercoat provides a consistent surface to repaired walls and helps to create a smooth base on which to build up a rich and long-lasting finish. It's designed to match your chosen dark tone top coat colour, and the excellent adhesion when applying means it will also enhance your new colour. This primer and undercoat should be used on interior surfaces - apply directly to the surface using a brush, roller or spray and leave for 11 hours to dry. This tin will cover up to 9m² per 750ml on average.