How to Install a Glass Mosaic Tile Backsplash

Stir the premixed urethane grout gently but thoroughly until its texture is uniform. (We used a drill/driver fitted with a paint-mixing bit, at a slow speed.) Let it sit for a few minutes, until any air bubbles have dissipated. Working on one small section at a time, wipe the tile with a wet sponge until the surface is slick. Apply grout using an epoxy grout float, pulling it horizontally and vertically over the tile to work it into the joints. Once the joints are packed, pull the float diagonally across the tile to remove excess from the tile faces, then mold the joints to eliminate high points by wiping the tile in a circular motion with a wet sponge. Remove traces of grout from the surface by lightly wiping a clean, damp sponge diagonally across the tile. Repeat, section by section, for the entire wall.