Substrate preparation

• Completely remove the old plaster, uneven sections of the wall and possible gypsum traces
• Thoroughly pressure-wash the surface to be plastered

Finishing

• Fill and patch cracks and holes with RIALTO MALTA GREZZA GM, a ready-to-use wet mortar for plastering and tile-laying. It is composed of three-month-seasoned slaked lime (made by baking river pebbles mixed with selected siliceous sand in the correct granulometric proportion, free of cement or any other additive) and water vapor permeable. Mix before use with RIALTO COCCIOPESTO CC (made from brick powder and selected crushed terracotta shingles) to induce the hydraulic reaction which improves the properties of the mortar (mechanical, physical and chemical strength reached in a shorter period of time)
   
• Patch the plaster surface applying three coats of RIALTO MALTA GREZZA GM
   
• First apply a thin scratch coat (3-5 mm thickness) and allow to dry for at least 24 hours
   
• Apply a new scratch coat, spreading the product in layers of 1-1.5 cm thickness until the desired thickness is obtained
   
• Allow each coat to dry completely before proceeding. Drying times depend on weather conditions and the substrate nature (at least 2-3 days)
   
• Thoroughly dampen the underlying layer before applying a new one
  Possible cracks can be easily fixed and restored with a sponge trowel even after a day thanks to the high workability of the product. Average covering capacity per 1 cm thickness:
  - RIALTO MALTA GREZZA GM 16 kg/m²
  - RIALTO COCCIOPESTO CC 2 kg/m²
   
• Allow at least 5-6 days, then thoroughly dampen the substrate and apply RIALTO MALTA FINE FM using a stainless steel trowel. RIALTO MALTA FINE FM is a wet ready-to-use mortar for fine plaster composed of seasoned slaked lime (made by baking river pebbles, mixed with siliceous sand in the correct granulometric proportion for at least 3 months), free from cement and other additives, with high adhesion power and water vapor permeable. Before use, it can be mixed with RIALTO COCCIOPESTO CC (made from brick powder and selected crushed terracotta shingles) to induce the hydraulic reaction which improves the properties of the mortar (mechanical, physical and chemical strength reached in a shorter period of time). Average covering capacity per 1 layer of fine mortar:
  - RIALTO MALTA FINE FM 2,5 kg/m²
  - RIALTO COCCIOPESTO CC 0,4 kg/m²
   
• Level the surface using a sponge trowel to obtain an even "fine-finished" plaster
  

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