Applied over flagstone and lueders cap stone on a patio and walkway. While it may appear pricey compared to other sealers this stuff is heavy duty. The percentage of suspended solids (Silane siloxane) is much higher than similar products so you are getting more sealing bang for your buck. I applied it over previously sealed flagtone that needed resealing as it no longer repelled water. Very easy to apply with a garden pump sprayer and easy to clean up. I waited until we had significant rains before reviewing, and I can report I am very happy with this product. The previous sealer I used never repelled water like this. In fact, it seals so well that 2 days after the rain there are puddles in low spots that do not absorb into the stone. I can recommend this to anyone who wants to seal natural stone or reseal stone that needs to be resealed because the intiial sealer has failed.