The No. GW07 Color Enhancer is a low VOC (Volatile Organic Compounds) compliant, water based natural stone color enhancer that seals and penetrates grout, stone and masonry surfaces to protect against oil and water based stains. The no mess foam formula clings to vertical surfaces providing accurate, non-streak coverage. Can be applied to cured grout, masonry, quarry, satillo, slate, terra cotta, sandstone, brick and precast stone.