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Steps
1
Mask off countertops, outlets, and nearby fixtures using painter's tape to protect them from grout and debris.
2
Carefully remove the old, damaged, or stained grout from between the tiles using a grout saw or an oscillating multi-tool. Be cautious not to chip the edges of the tiles during this process.
3
Vacuum all dust from the joints and wipe the area with a damp sponge to ensure the lines are clean and prepared for the fresh grout.
4
Mix the new grout according to the package instructions until it reaches a smooth and spreadable consistency.
5
Pack the grout into the lines using a rubber grout float, holding the tool at a 45-degree angle to the joints to ensure the gaps are fully filled.
Tip: Work in small sections to prevent the grout from setting up before you can wipe away the haze.
6
Remove excess grout by dragging the rubber float diagonally across the tiles.
7
Allow the grout to set for 10-15 minutes, then wipe away the remaining residue with a damp sponge. Rinse the sponge frequently in clean water.
8
Let the grout cure completely, which typically takes 24 hours. Once cured, buff the tiles with a dry microfiber cloth to remove any remaining haze.
9
Apply a grout sealer to the joints to provide long-lasting protection against stains and mold.
Pro Tips
Never layer new grout over old grout as it will not last.
Using multiple sponges makes cleaning easier, as clean tiles are easier to buff than scrub.