I am having several old cast iron tubs refinished in place. The person doing the work says they usually spray over the bottom drain. I would rather not do this as it is an area where peeling will definitely start. My plumber does not recommend I try to remove and replate the drain as we cannot get underneath it without major work, which I would like to avoid. He said someone makes a decorative cover which simply fits over older drains, but he didn't know where I could get one.

any ideas? Thank you.