Ceresit CR 61 is adhesive to strong load carrying, clean, dry and damp substrates free from any substances decreasing the adhesion. The surface must be rough and porous to ensure good adhesion. The existing layers, the destroyed plaster or rotted parts of the walls should be removed to the height of at least 80 cm over the damp or salted sphere, thus uncovering the carrying substrate. The weathered joints should be removed to the depth of 20 mm, and then filled with the plaster CR 62 or lime mortar. Salty discolouration should be removed with steel brushes. The surface of walls and concrete should be moistened. On the moistened mat substrate there should be open work structure applied with the plaster CR 61 diluted to the proper consistency with the water solution of the emulsion Ceresit CC 81 (1 part of emulsion to be mixed with 3 parts of water). The rendering coat with the thickness of approximately 5 mm must cover evenly 50 % of the substrate surface. The renovation plaster should be applied after the rendering coat becomes hardened, minimum after 24 hours.