DuPont StoneTech Professional Heavy Duty Grout Sealer for Ceramic Tile
I was concerned with how thin this sealer was until I applied the second coat. The first was absorbed in almost no time at all and didn’t seem to do much of anything. When allowed to dry for 10 minutes, wiped down and given a second coating the results were much more obvious. The seal is solid, durable and lasts for a very long time. The only drawback is that is slightly darkens very light grout. It’s not a huge change, but it is notable if you want the grout to stay perfectly white.