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

This product does what it supposed to do and seals the counters thoroughly. I was able to roll out enriched dough and laminate croissant dough without any grease stains on the white stone.When doing a small counter top it is easy. Clean up is quick, and maintaining a wet surface is no problem. Larger countertops are more of a challenge. Because it is water based it is very runny. Masking off walls with tape helped keep it from the walls, but use good tape or it can soak through and create tape removal issues. The biggest problem with large countertops is the final clean up. Because this is a resin it can leave streaks. You must use microfiber cloths to wipe up the excess after treatment. Leaving a thin layer behind is the biggest issue with large countertops, as they start curing so quickly it is impossible to get a second pass that's not sticky. The best thing I found was to have multiple cloths at the ready and work quickly.

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 :)

One of the best you can use. One star deducted because it needs to be reapplied fairly often and it's really not "bulletproof" I had used this product for years on my Cashmere Ivory countertops and because of what I just mentioned I thought I'd try Sen-guard. That was awful and it soaked up water more than it did before I put it on. There was zero protection at least on this type of white absorbent stone from that. Then I tried professionally applied Granite Shield and got the same result as the Sen-guard. That cost hundreds but I got my money back and was told they never seen that happen before. I am now back to this Dupont Stonetech Professional BullietProof Sealer. It seems to work best and I use it around every 3 months now, especially around the sink area.It is so difficult to find a reliable stone protector. As a previous kitchen designer, I know that many stones (especially the darker denser ones) are already pretty resistant to stains and people get sold these sealers more than they need. They then think it's the sealer that is wonderful when really oftentimes it's just the stone and polishing done in the factory. To be safe, I'd still recommend a sealer. In my case, I should have trusted my training and instincts and not installed such a light absorbent granite. I knew better but I thought I'd just be careful. It was such a pretty slab, with pale sage green medallions throughout and the price was fantastic. Thing is, there is no amount of "careful" that can prevent water constantly being splashed around the sink and that water generally contains soap and food. It can start being absorbed before you're even done filling the dishwasher. That will eventually find its way into the stone making it darker than the rest of the kitchen by comparison. It also stays wet longer because it immediately starts to absorb, leaving you to believe that is only water it is and will dry back to the original light color. The good thing about natural granite is you can usually get the stains out with a poultice but what a big, time-consuming chore it is and mess you have to live with if it's more than just a small area. Bottom line is I recommend this product over several others I've tried but any water still needs to be wiped away immediately even though it's sealed.