There is a hole that has eroded away just by the drain. I have heard that steel epoxy painted with porcelain paint could do the trick. Is that something considered legitimate in order to make code in California? The alternative seems to be to rip out the sink, get another sink, redo the plumbing, and redo the tilework after it is installed. For the sake of someone just buying a house, I'd rather spend $10 than $500 right off the bat.