Great product! Couldn't be happier with the results. I prepped my stamped concrete patio first with a power wash to remove the crud. Then, applied a TSP wash followed by another power wash rinse. Applied AR500 with a roller with a 3/8" nap. Probably should have used 1/2" nap due do the depth of the low "grout" areas. No big deal though, just applied in small sections and used a brush to coat the low areas the roller missed. Was happy the product dried to touch in a 2-3 hours. The next day the finish was a perfect glossy, wet look. No funky spots and made the patio look like brand new. Will apply a second coat with the non slip grit as soon as I get a big enough weather window. Thank you Foundation Armor for giving my patio a better than brand new look!!