We're remodeling my mother's 1950s bathroom in a basement. A few years ago the hot water heater leaked and approx. 3" of water covered the basement floor popping the original tiles. The tiles were removed leaving the black tile adhesive (?) on the concrete floor. My mom decided to paint over the black. She simply used a paint color she liked from a DIY home store. She did not put on a sealer and I think she just put on a couple of coats of paint. I'm fairly confident it was not a concrete paint. It looked alright for a couple of years but now there are scratches on the floor and the black adhesive is showing through. I would like to leave the floors a painted concrete becuase they are so easy to take care of but I'm not sure if there is a say to repaint them so they'll continue to look good. Any suggestions?