We recently installed travertine around our new swimming pool. After much research on what product to use to protect the surface and to give us a non slip surface, we came across National Sealing Co. I’m so glad we did ! Kenny was very informative on the product and very responsive to my questions. All the scheduling and billing went very smooth. We were very pleased when Mark the installer arrived at the job site. He was very punctual, neat, professional, and all around nice guy. He communicated very well throughout the process as we watched the weather radar to plan our best time for application. It turned out great ! It looks fantastic and the surface is non slip. Very important with us around the pool. I would highly recommend this company !!