Kitchen or bathroom sinks can easily crack if they are made of ceramic material. Depending on the size of the crack, you will most likely be able to repair the damage without having to replace the sink or have a professional complete the repair at a cost. An epoxy adhesive will help you do the job.
Dry the entire sink completely. Use a soft cloth to wipe away moisture from the damaged area.
Apply a small amount of epoxy adhesive to the cracked area. Use a toothpick to spread the epoxy into the fine crack.
Dampen the sponge and use the corner of the sponge to carefully wipe away any epoxy that surrounds the crack. Do not wipe over the crack since it will take time for the epoxy to dry.
Allow the repair to dry for 24 hours, and then paint over it to help it blend with the ceramic sink.
Dip a paintbrush into the appliance paint, but do not soak the tip of the brush. Paint over the epoxied area with brush strokes going in one direction. Allow 10 minutes to dry, and then apply a second coat of paint if needed.