After a great deal of research, I picked this Tenax marble polishing powder for my black marble bathroom floor. Working on an expensive marble floor meant I wanted to be cautious at each stage — obviously, picking the best powder was a significant choice. I pay a lot of attention to online product reviews and tutorials (well, the thoughtful ones) and felt Tenax would be an excellent choice. My floor had some “etching” (this is the term tile people use to denote acid spots — maybe caused by bathroom products or splashing near the toilet) — I purchased the whole range of diamond abrasive pads, a stack of felt pads and a 5” polisher. The Tenax powder comes with only brief instructions — I like having instructions, but the online tutorials were plenty good enough as far as technique and, when I ended up with questions, I called Tenax and received some of the most patient and detailed advice I’ve ever gotten. Honestly, the company really showed its greatness and it gave me even more confidence in the product itself. My floor is now finished and I’ll next apply the Tenax sealer (I’m using “Tenax Pro Seal” and it’s a 7-year seal). By the way, it turned out I didn’t need the diamond pads after all — no harm in having them, but they’re really for actual scratches or other difficulties arising from actual abuse of the surface. I could not possibly have done the job nearly so well (nor so quickly) without the 5” polisher — if you’re thinking of doing a floor, kitchen counter or anything else of even moderate dimension, you’d be smart to get a polisher. I bought the Meguiar’s MT-300 right here on Amazon and, as recommended, used it as it’s slowest speed on one up from that. There are many kinds of stone surfaces, but I know the black marble I have is among the most challenging of the group — because of that, I felt the excellent result I’ve gotten would be worth telling other Amazon shoppers about. One more thing — a lot of the online tutorials show enormous floor polishers with enormous polishing pads. You’ll notice they’re being used for hotel lobbies, big city department stores, etc — most of us have residential kitchens and bathrooms and a 5” polisher makes for work that is both quick and detailed. I guess the enormous floor machines can be rented and maybe you feel tempted to do that — for me, it made more sense to have my own polisher, my own pads and the ability to polish spaces a commercial polisher could never approach.Product seems to work well. We used this on our onyx tile floor to bring the luster back to the surface. Despite not wearing footwear indoors, the tile eventually starts to fade a bit. The instructions aren't super clear, says to make a "toothpaste" like consistency, well that doesn't really happen with this product. It's more sandy than it is powdery, so it doesn't really conglomerate into a paste. Watched a few YT videos, and kind of just winged it. Used a 5" orbital sander with these pads:https://www.amazon.com/dp/B01H1ZF28G/ref=cm_cr_ryp_prd_ttl_sol_0I just used a spray bottle with water, sprinkled some of this product onto the floor, and then wet it all with the spray bottle. Wet the felt pad on the sander, and then started buffing. The stuff gets EVERYWHERE using the sander, but I expected a bit of a mess. Kept the sander moving at all times, and spent maybe 20-30 seconds per tile. Again, not really any detailed instructions how to use, so just went with what seemed right. Immediately wiped the floor with a damp rag, to remove residue. Did this for each section of tiles I was working on, eventually completing the whole floor. Then had to vacuum up the remaining mess of loose material, and wipe the entire floor down again with wet and then dry rags. Finished by resealing the tiles. Whole process for our relatively small bathroom was only a few hours. In the end, the luster has been brought back, but many of the scratches are still there, just looks more buffed now. So, perhaps I could have buffed with the sander on each tile for more time, and maybe that would have smoothed out all the scratches, but the shine is back, so I'm relatively happy. Again, I think more detailed instructions should be provided, or instructional videos be posted so people know the best procedure to get maximum results.I can't say this product is easy to remove or even to use. It requires some elbow grease, but now that I am finished old, dull marble floor is shining like it did when it was brand new. I tried many products and the results didn't come close to what I've experienced with this product. I bought the 2 pound container, and there was more than enough to do a large bathroom floor and shower enclosure, with a lot left over. Use it generously and rub like hell, or use an electric floor polisher and you'll be rewarded with a beautiful shiny floor when you are finished.. Compare it to other products and you'll realize how inexpensive this really is. Shipping was super fast.I had trouble removing soap scum accumulated on the red Alicante marble floor in the shower room. I last engage professional service to polish it in mid 2019. There’s a persistent cloudy look no matter what cleaner I use. Super fine steel wool #0000 works but sometimes leave rust on the white drain cover. Recently I discovered I can use this polishing powder with the 700g electrical brush I bought from Taobao. I just need to use the sponge attachment. It removes the white film on the marble without making it slippery.I also use my Bosch orbital sander with the sponge to polish marble tops. This is a new Bosch model which seems to move faster than my previous one. I get powder flying all over the place due to the faster speed. I have gotten better results with the broken sander that I replaced. For polishing surfaces, the tool matters. I hope to figure out how to do it right with my new sander. I do get a shine after a messy polishing session, but just not the shine that removes etched marks.It is kind of like powdered glass but worked well to remove a watermark on light glossy travertine without too much scratchingLo voy a probar