We used National Sealing recently to seal our Turkish shell stone pool deck, which had become very slippery when wet (dangerous for everyone, especially young kids). We opted for their proprietary non-slip bead application, which ended up being the right choice. The product was applied in a matter of hours, dried by the evening, and we were back to using our pool the next day. It did not change the appearance of the stone in any noticeable way, and has the perfect amount of grip without being too rough on the feet. Looking forward to the expected 4-5 year life as well. Kenny in the office and the applicator team were all responsive and professional/knowledgable. Would recommend them to anyone having slippery surface issues on their pool decks.