Xypex Concrete Waterproofing Products Whether used as admixtures and added directly to cast-in-place concrete, shotcrete and precast concrete, or as surface-applied coatings, Xypex Crystalline Technology products are recognized for their versatility in solving concrete waterproofing challenges. Proven in thousands of applications in diverse construction projects and environments, Xypex products are specified and requested throughout the construction industry by engineers, architects and contractors for the permanent protection of all types of concrete.