We had our pool deck and lanai of approximately 1,200 square feet of exotic travertine treated back in March 2018.  Although we were immediately impressed with the results, I wanted to wait to write the reviews to see how it did once the weather warmed up and we were actually using the pool and deck more.  The treatment transformed our deck from a super slippery danger zone surface to a non-slippery, safe, usable space.  I was so scared of kids and people slipping on our travertine pool deck, I would lay beach towels all over where people would walk.  If I didn’t, there was always a kid who would end up slipping. Before the treatment, I walked so gingerly and cautiously across the travertine because it was so slippery. . After the treatment, I could literally run across the deck (with it wet) and not slip.  Before we found National Sealing company online, we had ordered several products to apply ourselves.  After several attempts, we still had a very slippery deck.  Kenny was extremely professional, courteous, and easy to work with.  The treatment was expensive, but for the peace of mind and lasting results, well worth it.  The treatment also enhanced the beautiful colors in our travertine, making it look even better.