A chip in your kitchen or bathroom sink is not cause for concern. Chips are small nicks or missing pieces of ceramic. You can fix a chip without replacing the sink or hiring someone to do the job. All you need is a few supplies.
Clean the sink with warm water and gently scrub any grime off the surface with a soft-bristled brush. Dry the sink with a towel.
Fill the chipped area with epoxy. With a paintbrush, apply layers of epoxy until the chipped area is level with the rest of the sink's surface. Push epoxy into any cracks around the chipped area with the toothpick.
Remove epoxy surrounding the repaired area before it dries with a damp sponge.
Allow the epoxy to dry for 24 hours, then apply paint to the repaired area.
Let the paint dry for 24 hours before using the sink.