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The Ronseal Isoflex Liquid Rubber Black is a high-quality, professional-grade waterproofing product. Its specially designed to provide an ultimate waterproof seal on roofs and non-walkable surfaces. This 4.25 litre tin of black liquid rubber is perfect for sealing and protecting your roof from leaks, even in the most extreme weather conditions. The flexible formula ensures that it wont crack or peel, providing a long-lasting solution for all your roofing needs.