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Isonit - Iso Paint Nordic Fibercement

Product description:
Isonit is a water dilutable roof coating based on acrylic dispersions.

Product properties and use:
Isonit is used for roofs of fibre cement, concrete roof tiles, and primed steel roofs.
The coating flows well, has high covering strength, good adhesion abilities and creates a good strong water-repellent surface.
Not usable on clay tiles and natural slate.

Technical data

Water dilutable coating based on acrylic dispersions.

Standard colours: Black, anthracite grey dark, slate grey, anthracite grey, light grey, black blue, royal blue, forest green, bordeaux, dark brown, mocca, red brown, oxide red, tile red R-728, tile red and Swedish red.
Other colours are available on demand.

Packaging sizes:
20 l

1,06 – 1,23 kg/l depending on colour and gloss

6.000 - 7.000 cPs

Dry content:
Gloss 12: Approx. 42 w/w %, approx. 32 vol/vol %
Gloss 20: Approx. 37 w/w %, approx. 27 vol/vol %
Gloss 50: Approx. 37 w/w %, approx. 31 vol/vol %

12 at 60°
20 at 60°
50 at 60°
Pull of test:
On concrete tiles: 2,3 MPa
On fibre cement tiles: 2,4 MPa

Spreading rate:
3,3 – 6,5 m2/l


  Theoretical spreading rate 

 Recommended layer thickness, each layer 



6,5 m2/l

150 µm

60 µm

  Recommended layer thickness of finished coat 

3,3 m2/l

300 µm

120 µm

The practical spreading rate depends on application method, form and surface of the material.

The roof must be cleaned thoroughly using high-pressure and Iso A-Clean. Fibre cement roofs have to be primed with Eternit Primer in order to obtain a sustainable surface (see TDS).
The surface must be clean, dry, and sustainable.

The coating must be stirred before use.

If Isonit is used as primer (first layer), dilute with min. 20 % water.
If Isonit is used as a top coat, apply the coating non-diluted or diluted with max. 10 % water.

Application temperature:
The temperature must be between 8° C and 30° C, and
Application method:
Brush, roller, or airless, nozzles 19 – 21, 180 – 220 bar.
To ensure the right layer thickness, apply the paint in two layers, each with a layer thickness of 200 µm.

If Eternit Primer is used, the right layer thickness can be obtained with only one topcoat (min 200 µm).

Always make a test coat to ensure the compatibility of product and surface.

It is recommended to maintain coated roofs with a treatment with Iso A-Clean every second year – in order to keep the surface nice and clean.
Drying time:
Laboratory tests

 Wet layer thickness 200 µm 

 20 °C / 65 % RH 

Touch dry

1 hour


2 hours

Fully cured

24 hours

The drying time and time for recoating depend on layer thickness, temperature, relative air humidity, and air circulation.

Cleaning of equipment:
Water and soap

Cool, protected from frost, in tightly closed packaging, and out of reach of children

No spillage into drains, to be disposed of at the local recycling centre

VOC: Max. 40 g/l (Kat. A/d)

Isonit beforeIsonit after

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