When searching for a company to seal our travertine pool deck (make nonslip) and brick driveway, National Sealers offered the most information which I considered to be on point. I agreed to have the work completed and the installer, Martel, was professional and took a lot of pride in his work. We are very pleased with the final results. Note that after the pool deck was completed rain was moving into the area, so the installer patiently waited until it did rain and then left to go home which was a considerable distance. He returned two days later to complete everything.