Similar to raw linseed oil, our Boiled Linseed Oil is a superior quality oil that has been treated with hot air, so it dries more quickly, forming a tough and hard-wearing finish, imparting a natural lustre. A traditional treatment that is suitable for use on all wooden surfaces (except exterior Oak), and can also be used on all porous stone, terracotta tiles and metal. Boiled Linseed Oil penetrates and seals the surface, providing protection for all interior and exterior surfaces. It provides an attractive, long lasting, and slightly glossy sheen. Linseed oil is extracted from the seeds of the flax plant and then boiled to produce a high quality wood oil.