Waterproofing Membrane - Water Guard 491 Water Guard 491 is a high-performance waterproofing solution designed to protect concrete and masonry surfaces against water penetration and environmental damage. The product creates a durable moisture-resistant barrier that helps improve surface protection and long-term structural performance in exposed conditions. Its advanced formulation supports reliable waterproofing efficiency for residential, commercial, and infrastructure applications. Water Guard 491 is suitable for roofs, foundations, walls, wet areas, and external surfaces where durable moisture protection and weather resistance are essential.