STONETECH BulletProof Sealer, 1 Quart/32 OZ (946ML) Bottle

Worked very well on my marble countertops.

I mean, I’m not going to deliberately spill something on the finished surface to see how well it works, now am I? I used this to seal a hearthstone (not a countertop). I picked it after reading a lot of reviews of sealers on Amazon. I followed the directions and made sure that it stayed wet for 10-15 minutes, to allow the sealer to soak in. After reading all the reviews, I was worried about the blemishes and cloudiness that some reviewers wrote about - but I saw nothing of the kind. At the end of the application time, I wiped it down with freshly laundered white sackcloth towels. It dried evenly, and looks good - not shiny (we definitely didn’t want glossy). Before using it on the hearthstone, I “experimented” by applying it to a small section of a marble table top (I flipped the top over and applied it to the underside) and also to an inconspicuous area on the side of the hearthstone, to see how it flowed during application, and to see if there would be any change to the color of the stone once the sealer dried (answer is “none”). That helped me be more confident when it came time to brushing the sealer on the top, wide area of the expensive, extremely heavy and hard to replace hearthstone. While I expect someday some with a glass of red wine is going to trip and spill it on the hearthstone, I’m not going to tempt fate and deliberately spill something on it, so I can’t actually say anything about that. Also just FYI, the directions for the product say to re-apply it in something like 3 -5 years. Not sure I’m going to remember to do that. Finally - it had virtually no smell at all, so that was a big plus.

Used this on white grout in our bathroom. Doesn’t work great, but definitely helps. We try very hard to avoid dirt, even water, on our bathroom grout- obviously never achieving that entirely. After about 8 months they’re greying again. But it does make cleaning the grout easier, just need to do it regularly.

Excellent sealer for our marble tiles and easy to work with, as well as not much of a smell during application.

Treated my two bath sinks and kitchen counters, all granite. Easy to apply, piece of cake. Use flood coat technique. Just keep the counter wet for 20 minutes (I went a half hour) using a cheap, small paint pad. Every time you see a spot dry, whip the pad over it, that's all. As time passes the counter will tend to stay wet, that means the the granite has absorbed all it can (which is what you want). Then wipe dry with paper towels. Done. No stink, no nasty solvent smells, but I kept the exhaust fans running. So far so good; actually, I can't tell it's on there, totally clear, does not change the patina of the counter color (which is good). [UPDATE]: December 2015: water still beads up on the counters, no stains, great shine. I think that the folks having problems are not following proper procedure; just do what I did and you will have good results on granite (I can't verify other types of materials). [UPDATE]: February 2018: water still beads up, there is still no staining of any kind on the counters/sinks. I use a little Windex once weekly to clean, and the shine comes up like they were new. I think this summer I will give it another quick coat, just for normal maintenance. Probably no one will read this because my first post is old, but thought I would post anyway :)