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You can use K Rend K Pro Water Seal Coating 25kg to waterproof external render and masonry to protect it from issues caused by water ingress such as efflorescence, algae growth, frost and water-soluble pollutants.Long lasting and water-based, K Pro also resists oil, helping your surface to stay clean, dry and looking good.
Provides increased resistance to oil absorption, enabling the substrate to stay clean and dry for longer, allowing the background to breathe, maintaining the water vapour permeability of the substrate.