We finished our pool construction late last year and are ready to convert the pool to salt water now that the weather is warming up. The coping is made of a Lueders stone material and the same stone forms the spillway for the spa. I need to know what to use to seal the coping and the spillway. I want to put the best sealer possible on the coping and spa spillway to make it last as long as possible with the salt water pool. I also want to be sure that the sealer does not make the coping shiny or slippery. I don't mind if the sealer darkens the stone, I just don't want it shiny or slippery. Any recommendation would be greatly appreciated!