I have a concrete bird bath that I got from my grandma.she had it made for her some time in the 20’s it’s very heavy. I have had it since 1990 and it is starting to deteriorate it has rebar in it that is starting to show thru. I was wondering what kind of cement to coat it with? Or is there something else to use? And what kind of water prof paint or coating to go over the cement? It looks like it was painted white at some point. Thank you.