Repairing plaster KL 1.2

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Product description

The Fescon Repair Plaster is a cement-based, polymer-modified dry mortar with additives, designed for concrete surfaces. The maximum grain size is 1.2 mm. 

  • Easy to use
  • Good adhesion to the base
  • Good workability characteristics
  • Separate adhesives not required
  • Sprayable
  • Chloride-free
  • Rubbable
  • Breathable
  • Slow carbonation
  • Frost-resistant


  • Repairs of concrete structures both indoors and outdoors
  • Façade repairs and coatings
  • Finishing of repairs
The product is listed in the portal for building products that can be used in Nordic Swan Ecolabelled buildings.
GTIN code Product name Product number Package size
6416841430342 REPAIRING PLASTER KL 1.2 MM 43034 25 kg

Remove damaged concrete, for example by chiselling or water sand blasting. Shape the cavities and clean any rusted reinforcement bars or, if necessary, replace them with new ones. Apply one or two layers of Fescon Adhesive Plaster to the cleaned reinforcement bars. Clean the base of loose dust and dirt, for example by pressure washing. The surface must be damp enough to be darker in colour before coating begins. The best time to wet the surface is the previous night.


Refer to the bag for how much water the plaster requires. Add the dry material to the water and mix with a concrete mixer for around ten minutes. With a power mixer or a drill paddle, around one to two minutes of mixing is sufficient. Let the plaster stand for around ten minutes and mix it again for a short while. Find the correct consistency at this stage by gradually adding the rest of the water. We do not recommend adding all of the water right at the start. The finished plaster remains workable for around two hours.


Fescon Repairing Plaster 1.2 mm is sprayed throughout into a layer about 3 mm thick. Level the surface if necessary. You should not float the surface to bring the cement paste to the surface. After the surface has hardened for at least a day, spray a second layer of repairing plaster, if necessary, into a layer about 3 mm thick. Level and float or brush the plaster into the desired profile. You should always carry out the finishing very carefully in order not to reduce adhesion to the base.


Begin repairs by first patching up any deep cavities. Choose the largest possible grain size for the repairing plaster according to the depth of the cavity. Recommended layer thickness is 2-15 mm. Best adhesion to the base can be achieved using Adhesive Plaster and filling layer by layer. Each layer must be allowed to harden for at least one day before the next application. Always leave the surface of the previous fill layer rough. You should carry out the finishing very carefully in order not to reduce adhesion to the base. For structural repairs, you should use, for example, Fescon Repair Concrete RKB.

After treatment

You must care for both repaired and coated areas by spraying with water and/or protecting them with a plastic film. The need for aftercare depends on the conditions. It should continue for at least one to three days.

Storage and handling of waste
See the separate storage and disposal instructions

Material usage

1,8 kg/m²/mm

Water requirement 3.0-3.5 l/25 kg
Type powder
Colour gray
Maximum grain size

1,2 mm

Package size 25 kg

storage time in a dry location approx. 1 year

Layer thickness

2 - 15 mm/filling

Lowest usage temperature


Workability time 2 h
Compressive strength

approx. 25 MPa

Adhesion strength

> 1.5 MPa, does not decrease after 100 freeze-melt cycles (SFS 5447)

Flexural bond strength approx. 8.0 MPa

approx. 1.0 ‰ (28 d prism)

Linear expansion coefficient

(1 °C) 14.7 x 10-6/ °C

Reaction to fire A2

approx. 5 mm (91 days, expedited test)

Limitation of liability, product use notes and restrictions: Please familiarize yourself with Fescon Oy's general terms of delivery and the design and work instructions related to the product.