General description Knot Block Wood Primer and Undercoat is designed to completely stop wood knots and resins from showing through your paint. It effectively covers bold colors and dark marks, ensuring that your paint adheres well for a flawless finish that won't yellow, crack, or peel. This product is perfect for knotty wood types such as pine. Technical specifications Volume: 250ml Coverage: 12 m² per litre Ready to paint over in 4 hours