EVO-STIK Wall Tile Grout Mould Resistant is a fast setting, cement-based grout suitable for finishing joints in internal and external ceramic tile installations. When set it is completely waterproof and will not wash out of joints, making it ideal for use in areas subject to frequent wetting and condensation such as power showers, kitchens and bathrooms. Sets in 3 hours. Mould and frost resistant. Suitable for interior and exterior use.