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- 1). Dig out the old grout from between the tiles wherever it's damaged, using a grout saw. A grout saw looks like a thick razor blade on a handle. Scrape the saw forward and back over the grout, breaking into the surface and digging down. Dig out the whole length of grout alongside each tile where the grout line has any damage at all.
- 2). Suck up the dust and debris with a vacuum hose to get the area completely clean.
- 3). Pour about 1 inch of water into the bottom of a bucket. Cover it with roughly the same amount of powered grout. Stir it vigorously with your drywall knife. Add more water and more powder, alternately, until the grout is the consistency of thick mud. Make enough grout to fill all the joints you dug out.
- 4). Let the grout sit in the bucket for 10 minutes. Stir it again.
- 5). Scoop up some grout with your rubber grout trowel. Press it immediately onto one of the open joint lines. Run the trowel over the joint at a 45-degree angle, scraping it firmly and pressing the grout into the joint. Repeat for each open joint.
- 6). Let the grout sit in the joints for 10 minutes. Wipe down the tiles with a damp sponge to smooth the grout lines and remove the residual grout off the surface of the tiles. Let the grout set for 48 hours before using the surface.
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