What You'll Need:
- Cloth
- Small brush
- Putty knife
- Epoxy
- Sponge
Step 1: Clean the Area
First of all, you need to clean the area properly. Wipe it with a damp cloth, and make sure to remove any dust, debris or other residue from the hole or around the crack. You may need a small brush to dust away any residue.
Step 2: Filling with Epoxy
Once the area has been cleaned, you can proceed to fill it up with epoxy resin or grout. This is a tile filler which, if applied properly, will repair the chip, crack or hole effectively. Try to match its color as much as possible to the color of the tile. Use a putty knife to apply the epoxy, and make sure to fill the chip, crack or hole. Spread it as neatly as you can by trying to gain a level surfacing that is linear with the rest of the tile.
Step 3: Finishing up
Once done, wipe away any excess with a rag or sponge. You will need to act swiftly so as not to allow too much time for the epoxy to set.
Source: www.DoItYourself.com