WaterFine Primer

Product description

WaterFine Primer is a two-pack, anticorrosive, quick drying, water borne epoxy primer/intermediate paint which cures down to 5°C. Contains active corrosion protective pigments and flashrusting inhibitors.

Recommended use

As a primer/intermediate paint on steel, aluminium, galvanized steel and thermally sprayed zinc surfaces above the waterline. May be overcoated with water borne acrylics, water borne epoxy and suitable solvent borne coatings.

Film thickness and spreading rate

                                                                                          Minimum                Maximum                       Typical

Film thickness, dry (µm)                                                 60                            125                                 100

Film thickness, wet (µm)                                               135                           270                                 220

Theoretical spreading rate (m²/l)                                 7,6                            3,7                                   4,6

Physical properties

Colour Grey, Red

Solids (vol %)* 46 ± 2

Flash point Non flammable

Gloss Glossy

Water resistance Very good

Flexibility Excellent

*Measured according to ISO 3233:1998 (E) Theorectically calculated VOC: 60g/L

Surface preparation

All surfaces should be clean, dry and free from contamination. The surface should be assessed and treated in accordance with ISO 8504.

Bare steel

Cleanliness: Blast cleaning to min. Sa 2 ½ (ISO 8501-1:2007) or for maintenance UHPWJ to WJ2 (NACE No.5/SSPC- SP 12). Roughness: using abrasives suitable to achieve grade Fine to Medium G (30-85 µm, Ry5) (ISO 8503-2)

Shopprimed steel

Clean, dry and undamaged approved shopprimer.

Other surfaces

The coating may be used on other substrates. Please contact your local Jotun office for more information.

Condition during application

The temperature of the substrate should be minimum 5°C and at least 3°C above the dew point of the air, temperature and relative humidity measured in the vicinity of the substrate. Good ventilation is required in confined areas to ensure correct drying.

Application methods

Spray Use airless spray

Brush Recommended for stripe coating and small areas, care must be taken to achieve the specified dry film thickness.

Roller May be used for small areas but not recommended for first primer coat, however when using roller application care must be taken to apply sufficient material in order to achieve the specified dry film thickness.

Application data

Mixing ratio (volume) 1:1.2

Mixing 1 part of Comp. A to be thoroughly mixed with 1.2 part of WaterFine Primer, Comp.

B. To secure a proper mix. a mechanical stirrer should be used to stir up both the

components separately before mixture and during the mixing of the two components thoroughly down to the bottom of the can (mix for at least 5 minutes).

Induction time 15 minutes.




Thinner Water. Fresh clean water.

Cleaner Jotun Thinner No. 17 and Jotun Thinner No. 4

Guiding data airless spray

Pressure at nozzle 15 MPa (150 kp/cm² 2100 psi)

Nozzle tip 0.38-0.53 mm (0.017-0.023")

Spray angle 40-80°

Filter Make certain that the filters are perfectly clean.

Note In order to secure a proper mixing, it is recommended that the temperature of the two components is approximately 20ºC when mixing.

Drying time

Drying times are generally related to air circulation, temperature, film thickness and number of coats, and will be affected correspondingly. The figures given in the table are typical with:

  • Good ventilation (Outdoor exposure or free circulation of air)

  • Typical film thickness

  • One coat on top of inert substrate

  • Relative humidity 70%.

Substrate temperature





Surface dry

60 min

60 min

45 min

45 min

Through dry

5 d

2 d

1 d

1 d


20 d

14 d

7 d

5 d

Dry to recoat, minimum

24 h

10 h

1,5 h

1,5 h

Dry to handle : 5ºC = 6 hours, 10ºC = 2 hours, 23ºC = 2 hours, 35ºC = 1 hour.

The given data must be considered as guidelines only. The actual drying time/times before recoating may be shorter or longer, depending on film thickness, ventilation, humidity, underlying paint system, requirement for early handling and mechanical strength etc. A complete system can be described on a system sheet, where all parameters and special conditions could be included.


Typical paint system


Corrosivity category C4 (ISO 12944):


WaterFine Primer

WaterFine Topcoat

2 x 100 µm

1 x 50 µm

(Dry Film Thickness)

(Dry Film Thickness)


Corrosivity category C5-I (ISO 12944), (System 1, NORSOK M-501)

WaterFine Barrier

WaterFine Primer

WaterFine Topcoat

1 x 50 µm

1 x 120 µm

1 x 80 µm

(Dry Film Thickness)

(Dry Film Thickness)

(Dry Film Thickness)

Other systems may be specified, depending on area of use

Procedure for preparation and cleaning of application equipment

To avoid solvent contamination of the water borne paint the spraying equipment has to be conditioned before use. All equipment containing solvents in the pump, hoses and gun have to be thoroughly cleaned according to the following instructions.

If the application equipment is made in stainless steel, designed for and only used for application of water borne coatings this preparation and cleaning procedure is not needed.

Before spraying:

Circulate Jotun Thinner No. 17 through the equipment and hoses. Then Jotun Thinner No. 4 before fresh clean water.

After spraying:

Clean the equipment and hoses with water and detergent (Kraftvask), then circulate Jotun Thinner No. 4 and finally Jotun Thinner No. 17.


Storage conditions are to keep the container in a dry, cool well ventilated space and away from source of heat and ignition and in accordance to national regulations. Containers must be kept tightly closed and kept away from freezing. Shelf life at 23ºC: Comp. A, 2 years; Comp. B, 1 years. Subject to re-inspection thereafter. Storage at elevated temperatures will reduce product shelf life significantly.


Handle with care. Stir well before use.

Packing size

20 litre unit: 9 litres Comp. A in a 10 litre container and 11 litres WaterFine Primer, Comp. B in a 20 litre container

Health and safety

Please observe the precautionary notices displayed on the container. Use under well ventilated conditions. Do not breathe or inhale mist. Avoid skin contact. Spillage on the skin should immediately be removed with suitable cleanser, soap and water. Eyes should be well flushed with water and medical attention sought immediately.