All home repair requires the knowledge of the project at hand. When it comes to repairing cracks and dents in the bathroom sink, it is important to know the material you are working with before getting started. Once you know what the sink is made of, you are able to then follow a few simple steps to fix the crack. Replacing the sink entirely is the last thing you want to do because of the time and money involved, so fix it as best you can without damaging it any further.
Dry the sink entirely using a hand-held hairdryer. Any dampness or water will not allow the adhesive to fill in the crack and dry properly.
Use the toothpick to slowly and smoothly fill in the crack using the epoxy adhesive. The toothpick allows for a solid structure to move the wet epoxy through the crack only where it is needed without spreading it along the surface of the sink.
Wait 24 hours for the epoxy to dry.
Paint the dried epoxy with appliance paint that matches the colour of your plastic or porcelain sink. A small, thin paintbrush is needed for precision so you do not paint over an area that was not cracked to begin with.
Let the paint dry.
If it is not a crack in the sink, but simply a chip or dent, you can use enamel filler to fill in the chipped area. Once it dries you should not be able to tell anything happened. If the crack becomes enlarged are was extremely large to begin with, it is best to replace the entire sink rather than fill in the cracks.
Wash hands after using adhesive epoxy and paint.