A Surface Tolerant High Build Epoxy Primer for Steel.

Suitable for use underwater. May be used when abrasive blast cleaning is not economic or practical. 300 mics in a single coat. Norsok approved.

Overcoat with a range of Hardtop Polyurethane paints for long term Colour & Protection. Winter grades available. Available in Aluminium, White, Black, Red and Grey. Free Next Day Delivery.

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Jotun Jotamastic 87 is a high build, high solids two pack surface tolerant epoxy primer

Jotamastic 87 is specifically designed for areas where optimum surface preparation is not possible or desired. It provides long lasting protection in environments with high corrosivity. 

It can be used as a primer, mid coat, finish coat or as a single coat system in atmospheric and immersed environments. The coating is suitable for properly prepared carbon steel and aged coating surfaces. It can be applied at sub zero temperatures.

Overcoat with a range of Hardtop Polyurethane paints such as Jotun Hardtop XP and Jotun Hardtop CA for long term Colour & Protection.

Jotamastic 87 is recommended for offshore environments including splash zones, refineries, power plants, bridges, buildings, mining equipment and general structural steel.

This coating system is available in 5 and 20 litre tins.


Jotamastic 87 is a high solids, high build, two pack surface tolerant epoxy mastic with excellent abrasion and corrosion resistance. The aluminium version is recommended as a first coat to provide extra corrosion and water resistance. It can be applied by Airless spray, brush or Roller. Jotamastic 87 Surface Tolerant Epoxy Primer is designed for use on steel when abrasive blast cleaning may not be possible. Jotamastic 87 Primer may be used above and below the water line, the winter grade version can be applied at sub zero temperatures. It is resistant to continuous operating temps of 120c and in immersed seawater at 50c.

Jotamastic 87 is a two pack epoxy semigloss suitable for use in atmospheric and immersed environments as a primer or intermediate coat in a multicoat system. It can be applied direct to carbon steel, stainless steel, galvanised steel, aluminium and over previously coated surfaces. Jotamastic 87 Surface Tolerant Epoxy Primer is recommended for offshore environments, new construction,  marine hulls, topside and superstructures. It can be applied up to 300 microns in a single coat by airless spray, two coats may be required to achieve the recommended DFT by roller.

The typical recommended specification range for the film thickness is 150 – 300 μm for dry film thickness, 180 – 365 μm for wet film thickness and 5.5 – 2.7 m²/l for the theoretical spreading rate.

To secure the lasting adhesion to the subsequent product all surfaces must be clean, dry and free from any contamination.

For a carbon steel and shop primed steel surface it is recommended that the surface is blast cleaned which makes it free of all visible oil, grease, dirt, dust, rust or any existing coatings.

For coated surfaces it is recommended that the surface is clean, dry and doesn’t have any damaged coatings.

This product can be applied airless spray, brush or roller.

Depending on the substrate temperature you are applying the coating at will depend on how fast the drying and curing time will be. The fastest the product will dry is at 40°C which will result in the product being touch dry in 2 hours, walk-on-dry in 4 hours, dry to over coat in 4 hours and dried/cured for service in 2 days.

Jotsamstic 87 is also able to resist a continuous heat of up to 120°C in dry and atmospheric environments and a continuous heat of up to 50°C as well as a peak heat of 60°C in immersed sea water environments.

Peak temperature duration is a maximum of 1 hour and the temperatures listed relate to the retention of protective properties. However, aesthetic properties may suffer at these temperatures.

Surface Preparation

Carbon Steel:  Minimum St 2 (ISO 8501-1)
Galvanised steel:  Surface to be clean and dry with a rough dull surface
Aluminium, Stainless:  Surface to be clean and dry, abrade with non metallic abrasives or pads
Painted surfaces:  Surface to be clean, dry and undamaged compatible coating, free from oil grease and other contaminants.

Technical Data

Jotamastic 87
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Jotamastic 87 Comp A
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Jotamastic 87 Comp B
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Volume Solids (ISO 3223):  82%
VOC Content:  210 g/lt
Flash point (ISO 3679): 35c
Dry Film thickness:  150-300 microns
Wet Film thickness:  180-365 microns
Theoretical coverage:  5.5-2.7 sq m/lt
Mix Ratio:  6:1
Pot Life 23c:  2 hrs
Touch Dry 23c:  7 hrs
Overcoat 23c:  10 hrs
Nozzle tip:  23-32 thou
Pressure at nozzle:  2100psi
Thinner:  No. 17
H&S:  Observe the precautionary information on the container. Refer to MSDS for full details on health and safety and storage regulations.


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