The cuprinol ultra tough wood filler in white delivers professional-grade repair performance engineered for demanding restoration and joinery applications. This 500g solvent-based formula hardens through chemical reaction, ensuring structural integrity across both interior and exterior wooden surfaces. Designed to address damage from wet rot and major structural repairs, this weather-resistant filler seamlessly fills knot holes, screw holes, and nail holes without shrinking, splitting or cracking. Workable for up to 10 minutes with a 30-minute drying time, it prepares surfaces effectively for varnishing, painting or staining. Once dry, the filler accepts sanding, drilling, screwing and nailing, delivering complete workability for subsequent finishing operations. Good adhesion to sound wood ensures reliable, long-lasting repairs in varied environmental conditions. Features & benefits: suitable for indoor and outdoor applications requiring weather-resistant wood repair. Repairs wet rot damage and handles major joinery restoration projects. Non-shrinking formula resists splitting and cracking for long-lasting durability. Fast-setting with 10-minute working time and 30-minute drying period. Accepts sanding, drilling, screwing and nailing once fully dry. Good adhesion to sound wood ensuring structural repair integrity. Fills knot holes, screw holes, and nail holes prior to varnishing, painting or staining. Size: 500g. Colour: white.