Thompsons Water Seal offers superb weather protection for bricks, mortar, stone, and concrete. Its advanced silicone micro emulsion soaks in deep to provide long-lasting protection against rain damage. Based on a unique water-based combination of alkyl polysiloxane resin and hydrophobic waxes, it shields your walls and surfaces from the ravages of weather, safeguarding against the damaging effects of frost and thaw. For best results, apply to damp surfaces – weather-resistant protection is just hours away. It forms a transparent, waterproof barrier providing invisible protection against water damage. This deep penetrating formula is for exterior use only and can be applied with a brush, roller, or sprayer. Two coats are required for full protection. Coverage is 4 sq m per litre. The product is a low viscosity liquid with a low, inoffensive odour and minimal VOC content. Use at full strength, do not dilute. Do not apply if the air or surface temperature is below 10 deg C or if it is raining. This is a final coat and is not suitable for over-painting.