Cemix 5kg Ultrafine Tile Grout - Dark GreyFlexible Smooth finish May be used in swimming pools when used in conjunction with Cemix Tile Bond Latex as an additive. For use with most types of mosaic, ceramic tiles and natural stone applications internal or external wall and floor grouting applications for joints between 1mm 8mm. CEMIX COLOURED GROUT is a flexible, smooth finish, cementitious grout. It is suitable for walls and floors in interior and exterior applications. It contains a biocide,