- 1). Remove any loose grout from the tile joints, using a small broom or vacuum. Larger pieces can be chipped into pieces with an awl or ice pick, then removed. Clear the joint being repaired completely down to the subsurface of the tile.
- 2). Scrape away the top surface of grouting that has been stained or discolored, using a grout scraper. To ensure good adhesion with the new grout, scrape away a minimum of 1/8 inch of the old grout.
- 3). Mix the grout mix in a small bucket according to the manufacturer's instructions in an amount appropriate to the area being covered. Fill a second small bucket of water for cleanup as the the grout is applied.
- 4). Spread the grout over the cleared or scraped tile joints, using a grout trowel. Work the grout mix back and forth over the joint to ensure the joint fills, then wipe away the excess with a damp sponge. The finished grout should be flush with the tile edges. Use a clean rag to wipe away the haze from the tile surfaces as the grout dries. Allow the new grout to cure for eight to 10 hours.
- 5). Apply grout sealer to complete the grout repair, following the manufacturer's instructions.
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