The surface must be dry and clean. The remnants of the old coating must be removed. Apply one coat of Fondo AS primer to the surface and allow to dry for 2 hours. Apply 2-3 coats of Elite Grassello plaster with an interval of 8 hours between coats (at a temperature of + 20 ° C and 65% relative humidity). After applying the last layer, it is necessary to level and polish the plaster with a trowel. After completely drying (24 hours), apply Cera Protettiva or Cera Decorativa to the surface and polish it.