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The Thompsons One Coat Water Seal 5l is a professional-grade waterproofing sealant ideal for exterior masonry. It uses a unique micro-silicone emulsion that penetrates deeply into porous brick, stone, concrete or render surfaces — even when slightly damp — to form a durable, invisible water-repellent barrier. Once applied, the seal dries quickly (typically within two hours) and offers reliable long-lasting protection against rain penetration, freeze/thaw damage, dampness and efflorescence, making it suitable for walls, stonework, and other exterior masonry exposed to the elements.
