Additional Details ------------------------------ Product description: Akemi Stain Repellent NANO-effect is a water and oil repellent and great resistant treatment for polished and rough natural and artificial stones. (marble, granite, sandstone, etc). It works excellently on grout. the product is weater-resistant, non-yellowing impregnation that lasts for years. Once hardened, the product is foodsafe. Natural color of the stone remains unchanged