Thompsons One Coat Water Seal 5l

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.

• Applies directly onto damp brick, stone, concrete or render surfaces.
• Single-coat application delivers effective waterproofing.
• Covers approximately 4 m² per litre for broad surface coverage.
• Dries in around 2 hours under normal conditions.
• Reduces water penetration, freeze-thaw damage and efflorescence.
• Forms an invisible, breathable membrane that repels water while allowing moisture vapour to escape.