How to Change Grout Color

How to Change Grout Color With a Colorant

1. Scrub the Grout Lines

   Use a commercial grout cleaner to thoroughly scrub the grout lines with a small stiff scrub brush. After scrubbing, rinse and neutralize the cleaner with clear water wiped over the tiles with a sponge.

   Tip

   The colorant product usually recommends a specific grout cleaner for this preparation step. It's best to follow this recommendation, as the products have been tested to be compatible with one another. You may also have good luck using ordinary white vinegar, followed by a paste made from a mixture of water and baking soda, as a cleanser for dirty grout lines.

2. Test the Colorant

   Find an inconspicuous spot on the tiled surface to test the colorant. Apply the colorant to a few inches of grout, then let dry as directed by the manufacturer. Make sure the colorant dries to a penetrating hard finish and that it bears up under light scrubbing without flaking off. If it does not perform well, you may want to try another type of colorant.

3. Clean and Rinse the Tile and Grout

   Using a sponge and water, clean and rinse the tile and grout thoroughly. Let the tile and grout dry overnight before moving on to coloring.

4. Mask Off the Tile Surfaces (Optional)

   Tape off the tile faces with painter's tape, if desired, leaving only the grout lines exposed. This is an optional step but is recommended by some tile professionals. Taping off is the best way to prevent staining on the face of unsealed tiles. It's best to work in small sections, taping off a few square feet and coloring it before moving on to the next section.

5. Apply Colorant

   Apply grout colorant with small stiff brush or a pen loaded with grout dye, following the manufacturer's directions. Work the colorant forcefully into the grout, trying to avoid getting too much colorant onto the face of the tiles. A toothbrush is a good tool to use for applying the colorant.

6. Wipe Off Excess Colorant

   While the colorant is still wet, wipe off any colorant that gets onto the face of the tile. Some products can be scrubbed off of tile as long as two hours later with a nylon-faced sponge, provided the tile is well-glazed. Follow the manufacturer's instructions carefully.

7. Seal, if Necessary

   Let the grout dry completely, as directed by the colorant manufacturer. Many colorant products are now pre-blended with sealer, requiring no further sealing after application. Others are pure dyes that must be top-coated with sealer after they dry.

   If directed by the manufacturer, brush on a sealer over the colorant after it dries completely. Sealing the grout lines prevents future discoloration. It is normal for the sealer to make the grout lines shiny and slightly darker.

How to Change Grout Color by Removing and Replacing It

Choose a new grout that is suitable for the tile installation. As a general rule, unsanded grout is used for grout joints under 1/8-inch wide, while sanded grout is used for joints 1/8-inch wide or wider. Epoxy grouts consist of an epoxy resin that is activated by a catalyst/hardener; they are appropriate for applications such as steam showers or shower floors.

1. Protect the Work Area

   Cover floors and furniture with plastic sheeting or drop cloths to protect surfaces.

2. Remove Old Grout

   Remove the old grout using an appropriate tool, such as a manual grout saw or a multi-tool fitted with a tile blade. Use a small flat-blade screwdriver and a utility knife to clean up the tile edges and get into tight spaces.

3. Inspect the Tiles

   Check to make sure that the tiles are securely attached to the substrate. Tap on the tiles with the plastic backside of a screwdriver. A hollow sound usually means that the attachment is weak and that the tile should be removed and replaced. Loose tiles are often indicated when grout lines are especially crumbly and easy to remove—just replacing the grout will not fix the problem.

4. Remove Grout Particles

   Remove the grout particles from between the tiles, using a shop vacuum with a flat nozzle attachment. Scrub the grout lines with a stiff brush as you move the vacuum nozzle, which will dislodge loose particles.

5. Add Pigment to Grout Mix (Optional)

   Add colorant pigment to the grout mix, if necessary. Grout comes in a fairly broad range of factory-mixed colors and this is usually sufficient for most uses. But you can create a custom color with powdered grout pigment or liquid grout dye. Make sure to blend the colorant and grout thoroughly, so the color is uniform throughout.

6. Apply the Grout

   Mix and apply the grout, following the manufacturer's directions. Grouting is a three-step process of filling the joints, removing the excess, and cleaning the tile faces. Tools required include a grout float, a grout sponge, and microfiber cloths for cleaning haze off the face of the tiles.

7. Let the Grout Cure

   Allow the grout to fully dry and cure before moving on to sealing. This may be as long as three days for some types of grout—follow the manufacturer's recommendations.

8. Seal Grout

   Seal the grout after it has fully cured if recommended by the grout manufacturer. The sealer helps protect the grout from stains and discoloration. Be aware that sealant slightly darkens grout and gives it a shiny appearance. Allow the sealer to dry overnight before allowing tile to get wet.

When to Call a Professional

While regrouting tile is not complicated, it is a tedious, exacting job that requires a great deal of patience. If you feel that you cannot do an adequate job, tile installers generally will agree to take on regrout projects.