Primastic

Product description

Primastic is a two-pack, surface-tolerant, high solids epoxy mastic coating. Available with different hardeners for varying substrate temperatures, Standard (Std) and Wintergrade (WG).

Recommended use

Anticorrosive coating for steel and concrete structures above water, also on steel where blast cleaning may not be possible.

Hong Kong rules: Category of paints - Other vessel coatings; VOC 200 gms/ltr HK EPD method (Ready to use); Exempt compound - N/A; Specific gravity: 1.53 (A+B);

Both VOC and Specific gravity values provided are typical values, subject to changes when

different colour involved.

Physical properties

Colour Black, Green, Grey, Off-white, Red

Solids (vol %)* 78 ± 2 Std Comp. B 72 ± 2 WG Comp. B

Flash point Std Comp. B:

35ºC ± 2 (Setaflash)

WG Comp. B:

31ºC ± 2 (Setaflash)

VOC Std Comp. B

180 gms/ltr UK-PG6/23(97). Appendix 3

WG Comp. B

230 gms/ltr UK-PG6/23(97). Appendix 3

Gloss Semigloss

Gloss retention Fair

Water resistance Good Abrasion resistance Very good Solvent resistance Good Chemical resistance Good Flexibility Good

*Measured according to ISO 3233:1998 (E)

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: Power tool cleaning to min. St 2, mill scale free (ISO 8501-1:2007). Improved surface treatment (blast cleaning to Sa 2½) will improve the performance.

Shopprimed steel

Clean, dry and undamaged approved shopprimer.

Coated surfaces

Clean, dry and undamaged compatible primer. Contact your local Jotun office for more information. For maintenance UHPWJ to WJ2 (NACE No.5/SSPC-SP 12) or Power tool cleaning to min. St 2 for rusted areas

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 +10°C (Std) (-5°C in WG) 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 proper drying. The coating should not be exposed to oil, chemicals or mechanical stress until cured.

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) Std Comp. B:

7:1

WG Comp. B:

4:1

Mixing 7 parts by volume Comp. A (Base) to 1 part Primastic, Std Comp. B (curing agent).

4 parts by volume Comp. A (Base) to 1 part Primastic, WG Comp. B (curing agent).

Induction time 10 minutes.

Pot life (23°C) Std Comp. B:

2 hours

WG Comp. B:

1 hour

Thinner/Cleaner Jotun Thinner No. 17

Guiding data airless spray

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

Nozzle tip 0.53 - 0.79 mm (0.021 - 0.031")

Spray angle 40 - 80°

Filter Check to ensure that the filters are clean

Note * The temperature of the mixture of base and curing agent is recommended to be at least 15°C, otherwise extra solvent may be required to obtain correct viscosity.

• Too much solvent results in lower sag resistance and slower cure.

• If extra solvent is necessary, this should be added after mixing of the two components.

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

1. Provided the surface is free from chalking and other contamination prior to application, there is normally no overcoating time limit. Best intercoat adhesion occurs, however, when the subsequent coat is applied before preceding coat has cured. If the coating has been exposed to direct sunlight for some time, special attention must be paid to surface cleaning and mattening/removal of the surface layer in order to obtain good adhesion.

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

Other systems may be specified, depending on area of use

Storage

The product must be stored in accordance with national regulations. Storage conditions are to keep the containers in a dry, cool, well ventilated space and away from source of heat and ignition. Containers must be kept tightly closed.

Handling

Handle with care. Stir well before use.

Packing size

16 litres Comp. A (base) in a 20 litre container and 2.3 litres Primastic, Std Comp. B (curing agent) in a 3 litre container. 16 litres Comp. A (base) in a 20 litre container and 4 litres Primastic, WG Comp B (curing agent) in a 5 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.