Used to seal concrete porch and exposed aggregate concrete driveway. I power-washed the surfaces, allowed them to dry for about 36 hrs. I used an cheap garden sprayer to apply, and allowed that to dry for another 30 hrs. application was quick and easy. A few days later water beads up nicely, and does not appear to soak into the surface. No discoloration was apparent. If it protects as advertised, it should be a good value. Of course, I won't know that for several years, but I have every expectation it will work.