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Jotamastic 90

Jotamastic 90 offers the longest lifetime in any environment. It has exceptional corrosion resistance, is fast drying - greatly improving efficiency, and is designed to be safely applied from 100 to 300 microns in a single coat over a wide temperature and humidity range.

Jotamastic 90 is surface tolerant and can be applied on surfaces that appear dry but where moisture remains and flash rusting has begun. It is ideal for use when blast cleaning is not possible.

Due to the extensive colour range it can be colour matched with the topcoat improving coverage. It can also be used as finished coat in areas with low UV exposure or where colour retention is not the primary focus.

Note:  The pack size (including hardener) is 5 litres and 20 litres nominal as the exact quantity of paint is colour dependent (the quantity of tint varies with each colour).

Use the Wintergrade version for application below 10°C and faster curing times in normal conditions.

Use the AL (Aluminium flake) version for increased coating flexibility, strength and an impenetrable barrier to water (only available in aluminium colour).

Recommended topcoats (above the waterline):

Standard: Conseal Touch-Up

Premium: Hardtop AX

Eco: Hardtop CA

Other topcoat options available. Please call us for advice.

Feature Details
Water Resistance Excellent
Thinner Jotun Thinners No. 17 or SML Epoxy Thinner
Solvent Resistance Good
Pot life @ 23°C 2 hours maximum
No. of recommended coats 3 x below waterline, 2 above waterline
Dry to re-coat @ 23°C 3 hours
Curing time @ 23°C 7 days
Coverage 6 to 8 m² per litre
Chemical Resistance Very Good
Application Method Brush, Roller or Airless Spray

Above Water
Below Water


Sally Tooze at Willow Boats uses Jotamastic 90.

"We use an airless sprayer to apply Jotamastic 90. Thinned by 10% pretty much all year. We like the process as we are able to apply a reasonably high build (80 microns dft) per coat. We're down to 2 primer coats at this rate which sits well within ISO 12944 guidelines for protection in environment c3".


"The Jotamastic 90 sands well with 120 grade discs leaving us prepped and primed ; 2 boats at a time, inside 1 week. This leaves us plenty of time for the pretty stuff!"


Sally Tooze - August 2020

Jotamastic 90
Product Features
  • Large colour range
  • Corrosion protection for up to 15 years on properly prepared steel
  • Can be overcoated in approx. 3 hours
  • For steel, stainless steel, aluminium, concrete & galvanised
Choose an option:
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From: £71.95 (£86.34 inc)
Fast Despatch and Delivery

You may also be interested in:
Thinners No. 17

Thinners No. 17 is the solvent base for Jotun's Jotamastic and Penguard range. Available in 5L & 20L sizes

Hardtop AX

A two-pack glossy polyurethane topcoat with excellent gloss and colour retention. Suitable for brush/roll as well as spray application. Hardtop AX has good chemical resistance and can be used in aggressive atmospheric environments.

Pioner Topcoat

Jotun Pioner Topcoat is a single pack, semi-gloss, acrylic topcoat which is suitable for use both above and below the waterline.

Penguard Clear Sealer

Penguard Clear Sealer is a transparent two-pack epoxy sealer with excellent waterproofing qualities.

SML Blue Stripe Roller

Thermobonded and solvent resistant for reduced fibre shedding. Available in various lengths and pack sizes. Ideal uses - Antifouling, single & 2 pack Primers.

Roller Frames/ Cages

A selection of roller frames and cages in varying sizes and lengths.

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