Mapei Ultracolor Plus FA is a flexible, fast-setting, polymer-modified grout designed for both interior and exterior tile installations. It is highly popular because it delivers consistent color, resists efflorescence, and contains built-in DropEffect® and BioBlock® technology for superior stain and mold resistance. Homeowners, installers, and designers prefer it because it offers rapid curing, easy cleanup, and excellent performance on floors, walls, and high-traffic surfaces.