I am a huge fan of the ar350 and I can honestly say I don't think I'll ever use another product again. My stamped concrete had not been sealed in about 5 years and the patio was really dull looking. Most of the color was gone and they looked really dirty. I pressure washed the surface and then applied the ar350 to a small test area. I let it sit for a few days and absolutely loved the results. They were really dark on comparison and it almost looked like the color was brought back to life! I sealed the entire patio and am very happy with the outcome. The product was easy to apply and I couldn't be more happier with my revived patio!