My housekeeper poured vinegar all over my stained concrete floors which burned through the sealer and left terrible marks. I called Jed, and he came over two times to help me fix the issue. He figured it out and he even gave me the materials to fix it on my own. I offered money and he refused. Keep in mind, that he didn't install the floors in the first place. I would recommend him anytime someone needs anything to do with stained concrete flooring.