Appliance enamel repair...
Check at any Home Depot or Lowe's - they usually have small jars of white enamel repair very close to the appliance section of the store. You can use it to do spot touch-up on appliances, bathtubs, etc.
I use it on my Kenmore wringer - a chip about 1 inch round. It did a fantastic job. The key is to dab it on and let it spread and smooth out on its own, rather than brushing it on.