So I am on day 6 of installing Cast Natural Stone on Durock over the chimney chase and fireplace surround. Using modified HD mortar mixed just a little thick. To spec the stones seemed to want to slide so I went a little thicker with spacers. I just read that I should have been wetting the Durock before installing the stone, which I haven't been doing. Should I go pick up a spray bottle and re-wet the mortar to make sure there's enough moisture for the mortar to properly cure? The stone seems pretty solid, but I did knock a couple of the bottom ones off when removing shims when the mortar was thumbprint cured and had to reinstall them.