UrbanFloor Hybrid Outdoor is by far the safest and most appealing outdoor polishing concrete system available today. Penetrating sealers fail to resist stains because of the great porosity in concrete, and thick acrylic coatings embedded with fine sands (anti slip) appear synthetic as well as peeling off in time. UrbanFloor HO protects the concrete unlike any penetrating sealer available in the market, and, unlike any top coat sealers, it leaves it looking classy as well as natural.