Bostik J115 Flexible Smooth Finish Grout is a modified grout for walls and floors. It is formulated to provide narrow to wide joints and dries to a very hard finish. It is easy to clean off and can be used with a variety of tile types including ceramic, porcelain, natural stone, mosaic, marble and quarry tiles. It is suitable for joints between 2mm to 15mm for both interior and exterior use.