Supplementary skim coat over existing thin plaster.

Structure type

Solid brick external walls or partitions, or floor slabs, plastered with thin traditional plaster (less than 7–8 mm) based on hydraulic binders (lime and cement, hydraulic lime, natural hydraulic lime), with or without an existing finish or paint.

Detail

Interior or exterior supplementary skim coat and finish over existing finishes or paints.

Application cycle

1. Interior or exterior plaster.
2. Solid brick wall (or alternatively brick, concrete, concrete blocks, aerated concrete blocks, wood-cement permanent formwork, etc.).
3. Existing hydraulic binder plaster (lime-cement, hydraulic lime, natural hydraulic lime) less than 7 – 8 mm thick, with or without an existing mineral finish or paint.
4. Thin patching skim coat over the existing plaster with RALLK Rasante K, to restore a flat surface.
5. Reinforced skim coat with RALLK Rasante K and primed glass fiber mesh of more than 150 g/m².
6. Troweled interior or exterior finish with RALLK Marmo K, or finish with a finishing coat, powder mineral finish, acrylic, siloxane, lime or silicate paste finish, or lime, siloxane, acrylic or silicate paint, as set out in the specifications.

Additional information

1. Check that the masonry is sound and clean, and free of dust, loose parts, demolition debris, soot, mold, salt efflorescence, other organic material, grease or anything else that could impair the bond of the skim coat to the substrate.
2. Check that the existing plaster is cohesive and well bonded to the wall, and free of dust, salt efflorescence, mold, soot, other organic material, oil, grease or anything else that could impair the bond between the skim coat and the plaster.
3. On cracked plaster, check the cause and stability of the cracks. For cracks wider than 2 mm, once they have been confirmed as stable and NOT structural, we recommend filling them first with RALLK Rasante K, applied with a spatula, 12 - 24 h before the skim coat.
4. See the individual product data sheets for application methods and precautions.