Miracle Sealants 511 Porous Plus Sealer

This is a great product to seal, waterproof, and protect natural stone. Goes on easy with a roller.

Good product although expensive

it does what it says

I hate to give 5 stars to something so expensive, but this stuff really works, and a little goes a long way. I needed to seal some very porous sandstone (6 tons of flagstone) and figured this wouldn't go nearly as far as it did. It doesn't change the appearance at all, except that now water beads on the surface. I was not able to give a second coat, which the instructions recommend. The first coat sealed so well that I couldn't get it to absorb any more fluid. I applied using a mini-roller, with a brush for really irregular places. This stuff has a VERY strong smell. Inside, I'd definitely recommend ventilation. You know how everything is labeled "causes cancer in California"? Well this stuff probably causes cancer even in Wyoming or Texas. It sure seals rock, though.

This will seal Kashmir White Granite when nothing else will. I’ve tried a number of “good” sealants on our bathroom counters, yet the counters continued to stain with anything that wasn’t pure water hitting them. I was almost to the point of pulling the counters in favor of quartz, but searched many stone forums and read reviews here on this product. Other reviewers here proclaimed success and their pictures showed they had this particular stone too. So I decided one last try was in order. I bought a stone poultice and went to the lengthy trouble of removing all the soap and lotion stains first (after using denatured alcohol to remove previous sealers), then treated the granite THREE times with this 511 Porous Plus sealer. It took three tries to get water to bead up. It was the first time water had ever beaded up on that stone! I poured some in a plastic cup and brushed it on with an old paint brush, waited the recommended time (maybe a little more), wiped up the excess with paper towels, and buffed dry with an old washcloth. As another reviewer mentioned, the sealer does bring out pale mica flecks inherent to this stone. 511 PP seems to not only soak into the stone, but also leaves a clear barrier on top. To my eyes this gives the stone more dimension, sort of like what happens when you put a worn stone into water to bring out its beauty. Use this one, not the regular 511 sealer available in your local big box hardware store. Anyway, it’s been a year since this adventure and I’m back buying another bottle to retreat my counters. This will be a yearly to-do in this house. The water is still beading up in most places, but there’s no way I want to go through the hassle of my initial poultice procedure. We were out of that bathroom for a couple weeks while that was going on. BTW, if you have a granite choice, NEVER choose this particular granite. It’s basically super-compressed limestone and as naturally porous as your concrete garage floor. Evidently with granite, the darker the better for resistance to staining.