Kiilto Airblock Coat
Coating against air leakages

A one-component, water-based, solvent-free liquid sealant. Can be applied with a high-pressure sprayer or roller on vertical, horizontal and ceiling surfaces.

Special features

  • a very elastic sealant coating against air leakages
  • liquid, paintable
  • for sealing walls and ceiling
  • for sealing wall, floor and ceiling junctions as well as joints in interior areas
  • tested and approved for radon




A sprayable and rollable, very elastic, ready to use sealant against air leakages. For interior use. Tested and approved for the prevention of radon diffusion. Excellent adhesion to various types of substrates. Easy to apply. Suitable for walls, floors and ceilings. Can be used to bind mineral wool fibres. If the asbestos cannot be removed and the material containing asbestos is in good condition, it can be coated with Kiilto Airblock Coat. We suggest marking materials containing asbestos in the drawings. Kiilto Airblock Coat is suitable for unheated interior areas.

Package Size EAN Code
15 kg/12,3 l 6411512707150
Application temperature

+15–25 °C

Bond strength

Different substrates: Concrete: 2.4MPa Coarse levelling compound: 1.2 MPa (Kiilto 70)
Smooth levelling compound: 1.7 MPa (Kiilto TopPlan)
Brick: 1.2 MPa Plywood: 1.1 MPa
Stainless steel (metal): 1.9 MPa
Aluminium: 2.3 MPa
Kiilto Block: 3.2 MPa
Kiilto Hydrablock: 2.8 MPa
Sand lime brick, chipboard, gypsum board and wall plasters: The adhesion exceeded the substrate strength.

Classifications and certificates





A paintlike gel


Approx. 1kg/m²

Crack bridging ability

2.2 mm (EN 1062-7 (mod))
With Kiilto Kerasafe Saumanauha sealing tape or Kiilto Butyylinauha butyl tape >10 mm

Density/specific weight


Fire class

B-s1,d0 (EN 13501-1:2018)

Frost resistance


Layer thickness

approx. 0.4 mm dry coat
(approx. 0.9 mm wet coat)

Package sizes

15 kg / 12,3 L


Can be stored above + 1 °C, in a tightly sealed original container max. 1 year.

Temperature resistance when dry

-20...+70 °C


SBR hybrid


Approx. 20,000 MPa

Water vapour permeability

Sd = 20 m
Vapour permeability (EN ISO 12572:2001 condition A)


approx. 8.5

Instructions for use

Remove all impurities that might impair adhesion, including loose particles, dust, dirt and salt deposit. Fill in dents and holes beforehand. Porous substrates can be primed with diluted (1:1) Kiilto Keraprimer, if necessary.

Stir Kiilto Airblock Coat before use. Apply at least two even coats of Airblock Coat. The second coat can be applied right after the first one (wet on wet). Follow the instructions on the required amount and consumption. Drying time depends on the prevailing conditions and the thickness of the applied coat. We recommend that the surface is coated (e.g. paint). If left uncoated, the product’s resistance to mechanical wear and UV light is limited.
Kiilto Airblock Coat can be used with Kiilto Butyylinauha tape or Kiilto KeraSafe Saumanauha sealing tape, if needed.

Tools: a roller or sprayer
Sprayer specifications: a piston pump or membrane pump, suitable for normal latex, spray nozzle size 0,017" - 0,019”, pressure 160–180 bar. Use personal protective equipment during spraying.

Additional information

The information given in this product data sheet is based on our tests and our practical knowledge. The technical data is defined under standard conditions. Variations in local working conditions and methods will affect the product performance and result. We guarantee the high quality of our products according to our Quality Management System. No liability can be accepted from incorrect use of the product or prevailing conditions, over which we have no control. Therefore, we cannot be held responsible for the final result. To use the product properly, please read the product brochure, work instructions and the safety data sheet available at

Environment and safety

Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Refer to the material safety data sheet. For more information about the product and package disposal, visit