Leach Stop 5G $376.55 Leach Stop – 5 Gallon Pail Leach Stop is an invisible, protective barrier that helps to prevent architectural precast, GFRC, concrete and natural stone surfaces from leaching minerals onto adjacent glass and metal surfaces which causes stains. This product protects the stone surfaces from water penetration. This product is designed for high-performance building restoration and preservation applications. Leach Stop Carries a 10 Year Warranty. Add to cart