To protect your concrete or tile flooring, the best product out there is NANO1000, a VOC-free, never peel or chip off lifetime warranty. NANO1000 is developed with nanotechnology and makes an inpenetrable new surface bond when applied to protect the area from stains and water damage. It is easy to apply (although any previous sealers must be completely removed), and works indoors or outdoors, on any natural porous material. It is invisible and can be used on floors, porches, patios, kitchen and bath countertops and grout.