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Thompsons 10 Year Roof Seal Black (often referred to as Thompsons HP 10Yr Roof Seal) is a high-performance elastomeric roof coating designed to provide long-lasting waterproof protection and repair for a wide range of roofing materials. It cures to form a flexible, durable membrane that moves with the roof, resists UV-induced fading and, once applied, becomes rainproof in about six hours. This tough seal outperforms traditional bitumen paints and can help protect felt, asphalt, slate, tiles and other surfaces for up to 10 years with proper application.