Ceramic tile repair is entirely possible for a do-it-yourselfer and can easily be done by following these steps:
Step 1 - Clean and Rinse
Clean the chipped area with detergent and water and rinse the dry with a blow dryer for about 15 minutes.
Step 2 - Apply Primer
Use a very small brush and apply a tiny amount of primer/sealer to the chip using caution so it doesn’t puddle or go on the surface. Allow the sealer to dry for at least 2 hours.
Step 3 - Apply Finish Paint
Apply a small amount of finish paint to the chipped area in the same manner that you applied the primer/sealer as you did in the previous Step 2. If you see a color difference between the paint and the chip, apply another coat of paint. Allow it to dry for 24 hours.
Step 4 - Apply Marine Epoxy
Mix your marine epoxy according to the manufacturer’s directions. You can color the epoxy by adding acrylic or water paint to the resin in a proportion of no more than 1:10. Dab the epoxy in small amounts with a toothpick into the chip. Add enough epoxy so that its surface is level with the surface of your tile. While allowing the marine epoxy time to dry, be sure you prevent the epoxy from being touched or disturbed.