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Mix the grout per the manufacturer's instructions.
Wet the tile with a sponge and try to avoid leaving any standing water in the joints.
Push the grout over the face of the tiles diagonally with the flat edge of the float to cut off excess grout. Make sure to fill in the holes and voids on the tile.
Note: When grouting the stair risers, be sure to place some cardboard on the treads to catch any grout that may fall form the risers.
Work in small manageable areas, and continue the process over the entire floor until all joints have been grouted.
Note: Grouting stone tiles is similar to grouting any other type of tile, but fill any holes and voids for this particular type of tile.
With a nearly dry sponge, tool the grout to eliminate pinholes, voids, highs and low spots.
Allow grout to set and haze over.
Do a final wipe with a nearly dry sponge pulled diagonally over the face of the tile to remove any grout residue.
Note: Grout should set for 24 hours before walking on it.
Wait from 48 to 72 hours before applying sealant to the tile and grout (this depends on the instructions on the particular sealant you choose).
Apply the sealant to both the grout joints and the tile face.