Initially used around a pool on a stamped concrete surface.
Concrete was sealed when put in but over the years it required power washing and had a algae problem. Cleaned the surface and rolled on the product 2 years ago and concrete looked great over the past two years. I purchased a second time for my drive. Amazing how it protects - Looks like a new drive where I rolled on the sealant. I will try to spray the remainder of the drive (it takes more to roll or brush on) only because of it takes longer and it should last as well. we shall see. Product is expensive but the Water Based version is good and easy to use and clean-up. comparable to similar producst and better than what you can find in big box stores.