The Jewson Patent Knotting Solution is a professional-grade, clear sealant designed to prevent the discolouration of paintwork on knotted wood surfaces. Ideal for both interior and exterior use, this 500ML solution penetrates deep into the wood knots, sealing them effectively and providing a durable finish. It prepares surfaces for painting or varnishing, ensuring they stay in prime condition for longer. The Jewson Patent Knotting Solution is easy to apply and quick drying, making it a reliable choice for DIY enthusiasts and professionals alike.