One word: DON'T I did It was gorgeous for a month, a little tired after two, clearly fading after 3 and greying/turning silver after 4. I tried to contact Messners - no response. I just stripped it and put on TWP (of course it rained that night)

J

I tried to do Sophie's method on my tile floors which had 24 years of dirt in the grout lines. I started on one section. The "rinse repeatedly" instruction is probably the hardest part since all that rinsing has to be sopped up. A wet vac helped, but there was still more sponging dry to do on hands and knees. And don't forget that the baseboards have to be protected. After 4 hours, I felt like I'd barely made a dent, and the rest of the floor seemed to yawn in front of me like it was an acre wide. I ended up hiring a pro to clean the grout. The scope of work included sealer. And no, it was not cheap, but it came out beautiful. They have the machinery to do it right. The floor ended up looking like it was newly installed. Of course, it's key to get people who knew what they were doing. This company had done floors for two neighbors of mine, got high ratings on Angie's List, and when they came for the estimate, were clear, informed, and answered my questions in a professional manner.

TriNova Granite Sealer and Tuff Duck are the best especially if you are looking for waterproofing purpose. Here https://graniteprotect.com/ you can also see the list of the best granite sealers. I also love the acrylics type of topical sealing because they are very easy to apply and cheap in price as well. On the other hand, I found Black Diamond Stoneworks Ultimate Grout Sealer very reliable and convenient because it doesn't produce strong odor and works equally for both colored and white Grout. I have also used granite gold and found it good. I would recommend you to use topical sealer or sealer with penetration and polishing qualities.