One of the most common questions I get from my customers is why it matters whether a dog is cast iron, versus some other kind of metal, and how you can tell the difference. First of all, I would like to state...
You can't. :-) But, I have a customer that raves about duco cement. It fills in the cracks, and helps even out the rough edges where pieces of the porcelain have been lost or pulverized, and with a touch up...