Skim the surface by applying the cementitious levelling product with high thermal conductivity with a large metal trowel or rake. The thickness must be at least 3 mm over the dimples in the panels, up to a maximum total thickness of 40 mm.
Apply the adhesive using the double-buttering method with a notched trowel suitable for the type and format of the tiles so that the back of the tiles is sufficiently wetted with adhesive.