Hi All. This is along the lines of my question as well. After I use the High-Temp mortar mix to close off the face of the oven (that’s the mortar i’m supposed to use…right?)…what mortar do I use to attach the granite face I plan on putting over the top of the close off area?? Also…how long do I wait before I attach the granite face piece (here in AZ…where it is ave 107F daily)?