Discover the Rosner NaturExpert Oil Hardener in a convenient 0.5-liter size, specially formulated as a reaction component based on advanced polyisocyanates. This high-quality hardener is designed to enhance the durability and performance of NaturExpert oils, ensuring your projects achieve a professional finish. Safe to use and not self-igniting, this hardener is perfect for various applications, making it an essential addition to your toolkit. Elevate your woodworking and DIY projects with Rosner's trusted innovation.