Mix grout thoroughly making sure there are no lumps. Most grouts are best left to stand for a few minutes before use. If the tiles are glazed, you can spread the grout all over the surface with a squeegee and then wipe off the excess with a damp sponge. Where the face of the tile is porous, i.e. terracotta or slate, you will need to point the grout lines with barely moist mortar. When the grout begins to set hard, it needs to be rubbed with a rounded stick or pointing tool. This will compact the grout to make it water resistant.
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