We recently built our pool and had the pool deck completed with tumbled travertine. The travertine was beautiful, but we soon found out it could get very slippery in areas when wet. We wanted to seal it but also make it less slippery. After researching ways to do this, we came across National Sealing Co. Kenny was friendly, informative, and knowledgeable from the first phone call to the last, after the job was completed. His team showed up on time, were friendly, happily answered all of our questions, and competed the deck the same day. The results are not only beautiful – they enhance the natural colors of our travertine – but also give us more peace of mind about the safety and lifetime quality of our deck. Highly recommend!