In order to maintain the characteristics of wood floors, it is necessary to provide them with a water-vapour permeable coating. Hard oil penetrates wood pores efficiently, creating an evenly durable surface. The oil makes the floor’s protective coating permeable, prevents it from cracking and worn spots can be treated locally, if necessary. Suitable for all untreated wood, cork and natural stone surfaces, especially for floors and other surfaces that require high durability, such as worktops. Finished surface is low-maintenance and water-repellent. Faded or ruined spots can be fixed exactly within the limits of wear. The product contains linseed oil, linseed oil-stand oil, tung oil-stand oil, turpentine resin oil, colophonium glycerine ester and lead-free drying agents. Hard oil can be tinted with natural pigments.