Features and Benefits

Repair plaster concentrate Additive concentrate for producing special plasters with moisture buffer


  • Permits diffusion
  • Hydrophobic capillaries
  • Easy to use
  • Plasticizing

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For producing plasters suitable for repair work. For repairing existing plasters. For modifying cement mortars (P III). For plasters with salt-containing aggregates. For repairing brickwork subject to efflorescence. For indoor and outdoor use.

Step by step

Substrate preparation


The substrate must be rough, open-pored and have a good keying structure. Completely chip off existing coatings and old, damaged plaster down to a sound substrate surface for a minimum of 80 cm beyond the visible damp and salt area. To ensure good adhesion, prepare a spatter plaster with the addition of CC 81. Apply the sprayed mortar in a net-like pattern to only 50 % cover. In the case of mixed brickwork, porous bricks and sand-lime bricks apply a pneumatic mortar layer of max. 5 mm thickness.



Mix Ceresit CO 84 with water at a ratio of 1 : 10 to 1 : 60 parts by volume. Use this mixing liquid to prepare the repair plaster. Then produce the mortar in a tumbling mixer with a clean, mixed-grain DIN 4226 aggregate, continuously graded in the favourable range. The mortar can be applied by mortar pump, e.g. Putzknecht S 30 and pump insert UE 8. Use the familiar method to apply the mortar with a minimum layer thickness of 20 mm and rub it over. If thin plasters or bedding mortars are to be applied later or if several plaster layers are to be applied, comb the surface up with a stiff broom. Protect the fresh mortar against too rapid drying and keep moist if necessary. After complete hardening and drying of the plaster (takes at least 28 days), apply only diffusible wall coverings or coatings.