Our pool was installed 2 years ago and I wished I had gone darker on the coping color. We also started noticing pitting from the salt water on the coping. I needed to seal my coping and after seeing this product I figured this was my chance to change the look. We were skeptical but purchased one bottle of the AR350. The coping is stamped concrete and never sealed previously. I pressure washed it best I could and applied it the next evening with a nap roller. The concrete soaked it up. The next day I applied one more coat. I absolutely love the look! It darkened it a shade or two and has a slight wet look. It looks way better than before. The water beads right off. I am planning on applying more every few years. Highly recommend!