The Weber G700 primer is used in both interior and exterior arrangements in order to level out the water absorption rate of the supporting surfaces and for obtaining a surface with increased adherence before applying the grouting. It increases at the same time the durability of the supporting surfaces while also enhancing the resistance of the putty, fact which allows the walls to breathe. Can be applied over base grouting and reinforcement adhesives in the case of thermal insulation systems. Before applying the natural stones, the surface must be clean, undeformable, dry, fixed, must have load capacity and must be free of substances which could prevent the adherence (greases, bitumen, dust etc.). The areas surrounding the application surface will be covered with duct tape and protection foil because a surface cannot be cleaned once stained.