Stone mosaic tiles are typically used as a border or inset in a typical tile floor. These mosaic tiles are arranged in a variety of patterns and groupings with a variety of stones. Stone mosaic tiles are grouted in the same way that regular tiles are grouted. The biggest difference is that you will need more grout because there are more tile joints between the tiles. Before grouting the stone tiles, it is important to seal the tiles. This will protect the tiles from any staining that may occur during grouting.
Put on gloves and a ventilation mask or respirator.
Pour the liquid stone enhancer (sealer) into a small tray or bucket. Use a 4-inch disposable foam brush to apply the stone enhancer to the top of the stone tiles.
Allow the stone enhancer to soak into the tiles for 30 minutes. Wipe up the extra sealer from the mosaic stone tiles with a rag. Let the stone enhancer dry according to the manufacturer's directions.
Mix the grout in a large clean bucket. Follow the mixing directions as indicated on the grout packaging.
Scoop a small amount of grout onto a rubber grout float. Use the float to press the grout into the stone mosaic tiles. Pack the grout tightly into the tile joints. Run the trowel over the mosaic tiles to remove as much excess grout as possible.
Clean up the face of the stone tiles with a damp grout sponge. Do not wet the sponge too much as this can weaken the grout. Clean up as much grout as possible from the tiles. Let the grout dry overnight.
Polish the top of the tiles with a soft dry cloth. This will remove the haze from the tiles.