How to properly put a finishing touch on your project by grouting the tile.
Mix the grout (latex-modified grout) to cover a small section. Scoop grout from the mixing container and set it on the tiles. Angle the grout float 45 degrees as you spread grout across the tiles, forcing it into the joints with the trailing edge. Move the float at angles to the tile pattern to fill the joints. Spread grout in alternating directions to force out air trapped in the joints. Grout the tile in sections and clean each section before grouting the next one.
When all the joints in the section are full, clean the grout float in a bucket of warm, clean water. Then use it to scrape excess grout from the tile. Hold the float almost perpendicular to the surface to remove the excess. Keep the float from pressing into the joints, or it will remove grout.