I have been gunited for about four weeks. Has anyone had any problems with the shells they put in pebble sheen? The color I want to use is the Ocean Blue that looks like Tahoe Blue in Pebble Tec but it has the smaller rock and it also has abalone type shells. I was told by non pebble tec companies not to do it that it may rust, but why would a company like Pebble Tec offer it if there was a problem?