Improve the adhesion of fillers and coatings on wood with Toupret Wood Hardener. This deep penetrating, water-based hardener is perfect for toughening rotten wood prior to filling, overcoating, or repair work. Suitable for both interior and exterior wood, it can be stained or painted with any type of conventional paint or coating. The product is supplied in a reusable tin with a handy brush integrated into the screw top. It adheres to damp wood and penetrates deep.