Spectralock® Pro Grout is a patented, high performance epoxy grout that offers color uniformity, durability and stain resistance with extraordinary ease of use. Spectralock® Pro Grout is designed for use on ceramic tile, glass tile and stone applications, both residential and commercial. It can be used both interior and exterior on floors and walls. Ideal for re-grouting applications, Spectralock® Pro Grout is perfect for swimming pools, fountains and other wet area applications.