Fine-Grained Repairing Mortar 205 Bostik

Model 205 Bostik
D max (mm) < 1
Applicable Thickness (mm) 5
Dry Unit Volume Weight (kg / l) 1,3 ± 0,2
Wet Unit Volume Weight (kg / l) 1,5 ± 0,2
Pot Life (min.) (at 20°C) ~ 30
Curing Time (hour) (at 20°C) ~ 24
Working Time (min) ~ 25
Compressive Strength (28 days) (N/mm2 ) ≥ 10
Flexural Strength (28 days) (N/mm2 ) ≥ 2
Water Mixing Ratio (for 25 kg dry mortar) 8,5 – 9,5 l
Environment temperature for application Between +5°C and +35°C
Colour Grey
Packaging (kg) 25
  • Resistant to water, frost and humidity
  • Plastic consistency
  • Easy to apply x High adhesion strength on surfaces
  • Cement-based; it keeps the interior humidity stable with excellent water vapour permeability
  • Hydraulic bounding quality
  • Fireproof

Areas of applications:

  • Interior and exterior
  • On walls and ceilings
  • In exposed concrete surfaces

A cement-based fine-grained repair mortar. It is suitable for interior and exterior use and in compliance with European Union Norms with anti-crack formulation and excellent water vapour permeability.

Preparation of the substrate:

  • In over-plaster applications, it should be rested for 72 hours after the plastering.
  • The separating substances such as dust, dirt, mould oil, slag, etc.; residues and wastes like cement, plaster and concrete should be removed from the surface.
  • Cracked plasters, weak surfaces and moss residues should be cleaned from the application surface.
  • Concrete, plastered walls and ceilings should be wet enough and primed with Bostik MultiPrim minimum 24 hours before.
  • The surfaces like exposed concrete should be primed with Bostik ContactPrimer before the application.
  • Highly absorbent concrete surfaces should be primed with adherence bridge installing mortar or Bostik MultiPrim.
  • Aerated concrete and porous brick surfaces should be primed with Bostik MultiPrim.
  • Other kind of surfaces should be dampened sufficiently; it should be applied after rested adequately.


  • Bostik 205 should be mixed with a low cycle mixer after pouring into a container filled with 8,5 – 9,5 lt of clean water at normal environment temperature until a smooth mixture is obtained. Mixing time should be minimum 3 minutes. The obtained mortar should be mixed for 3 minutes again in order to obtain a homogenous mixture.
  • The mixed mortar is ready to apply after an aging period of 3 minutes.
  • The fresh mortar should be used within 30 minutes.
  • In order to obtain a smooth surface, the material is polished and sanded with a water sandpaper after it hardens sufficiently.

After application: In order to avoid fast and unhealthy drying, the surfaces should be protected from direct sunlight and adverse air conditions such as heavy wind and frost. To obtain the recommended long term technical performance of the product, after the completion of the all application, the application and/or work should be covered and protected with a suitable coating or covering (paint, ceramic, tile etc…) as early as possible (depending on the product’s drying time within 3-7 days).

Coverage: Approx. 1,1 – 1,3 kg/m2 for 10 mm thickness.

* The coverage amounts are theoretical and it is recommended to do coverage-controlled sample application before treatment.

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