After you’ve installed your tile, you need to apply grout. Grout acts as a mortar between the tiles, securing them to each other so there is no slippage. Grout also finishes the floor; you don’t want gaps between your tiles. Once your tiles have set for 48 to 72 hours, you can apply the grout.
Mix the grout. Using a mixing tub, mix up enough grout to do the entire job. Do not mix up separate batches as this may result in color differentiation.
Continue to apply the grout to the floor, smoothing the grout into the joints. Allow the grout to set for approximately 30 minutes.
Allow the grout to set for 24 hours before sealing. Using a bottled sealer with a brush, follow the grout lines with the brush that is at the tip of the bottle. Maintain the same direction when applying to the grout; do not brush back and forth. Allow the seal to dry for 24 hours before washing your newly installed, newly grouted tile floor.