Thanks to everyone for your responses and advice!! I had a busy weekend and haven't been able to get back to it but I did look at the spot yesterday, briefly, and the discoloration is gone but it you look close, you can see an outline of something? I assume it comes from "stuff" in the poo. I hope its just on the sealant. I'm gonna try the revive and is that doesn't fix it, I will strip and polish. Thank everyone again very much!!