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The Octoral H25 HS420 Medium Activator Hardener is a high-quality paint additive manufactured by Octoral in the United Kingdom. This 1 litre bottle of transparent hardener is designed to enhance the quality and durability of your paint. With six new bottles available, you can easily purchase what you need for your next painting project. Ideal for garage equipment and tools, this product is a must-have for any vehicle enthusiast looking to achieve professional results.