Hi, I hope that I'm not covering old territory, but I couldn't find the exact answer to my question. I'm wanting to put cultured stone over the stone that is covering my fireplace surround (it looks like rip rap, ugly). Can I use a mortar mix to level the surface of the stones in order to install the cultured stone? If so, what kind of mortar should I use and should I wet the stones and mortar before putting the mortar over them? Thank you for considering my question.