Just bought our first home and the grout in the master bath was well lets just say no longer bright and white but I loved the actual tile so I bought this grout sealer and the floor looks brand new. It took me a while to finish because i have very tiny tile so there were a lot of grout lines to cover but I am astounded at the difference. It literally looks like a new floor. There were a few spots I could not get the sealer to “stick” but unless you are really looking you don’t even notice them. I would recommend this to anyone who needs a “floor makeover”. I went from a 35 year old dingy dirty tile floor to a beautiful “brand new” floor in a few hours instead of days. Great product.