I am a Contractor who has never laid a bit of stone. Generally, pretty smart when it comes to new projects. I have a customer who trusts noone else in their home to do work. They have a fireplace that is to be covered with Stoneworks Autumn and Buckeye fieldstone. I understand the wood sheeting exterior, tar paper, and lathe. My question is... without having experience in properly mixing mortars, is their a ready mix for the scratch coat and installation mortar that I can use to prevent the possibility of wrongly mixing these two?