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ZN-400 Series

Hardeners

Reaction components specifically matched to each system.

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Zenova ZN-420 2K Acrylic Hardener packaging

Isocyanate-based 2K hardeners optimised for acrylic primer systems and for standard, MS and HS clear coat systems.

In two-component (2K) paint systems, final hardness, chemical resistance and gloss depend on the quality of the chemical reaction between the base component and the hardener. The wrong hardener or an incorrect ratio can leave even the best clear coat soft, dull or brittle.

Each Zenova hardener is developed to match a specific product group: ZN-410 is formulated for acrylic primers, ZN-420 for standard 2K acrylic systems, ZN-430 for MS clear coats and paints, and ZN-440 for the premium HS clear coat system.

Hardeners react with moisture in the air. Closing the container tightly after use and never using product that has turned cloudy or gelled are critical to system performance.

  • System-specific

    A separately matched formulation for each product group.

  • Full cure

    Reaches the intended hardness and chemical resistance.

  • Balanced drying

    The optimum balance between flow and drying speed.

  • Lasting gloss

    Preserves the depth and gloss of clear coats over the long term.

Hardeners · 4 products

Our Hardeners

Click a product card to see its technical data, application steps and compatible products.

  • 2K
    HardenerZN-410

    2K Acrylic Primer Hardener

    2K hardener fully compatible with ZN-210, ZN-220 and ZN-250 acrylic primers; ensures a fast reaction, complete curing and easy sanding.

    View product
  • Zenova ZN-420 2K Acrylic Hardener packaging
    2K
    HardenerZN-420

    2K Acrylic Hardener

    General-purpose hardener for standard 2K acrylic paint and clear coat systems; delivers balanced drying and high chemical resistance with ZN-310.

    View product
  • 2K
    HardenerZN-430

    2K MS Hardener

    2K hardener optimised for ZN-320 MS clear coat; offers ideal flow, optimum drying speed and commercial performance that keeps pace with the workshop.

    View product
  • 2K
    HardenerZN-440

    2K HS Hardener

    Premium hardener specially formulated for ZN-330 HS clear coat; delivers lasting gloss, depth and maximum surface hardness.

    View product
Comparison

Hardener comparison table

Quickly compare the products by component type, suitable surfaces and pack sizes.

Hardener comparison table
ProductComponentsSuitable surfacesPackagingDetails
ZN-4102K Acrylic Primer Hardener2KSteel panel, Galvanised steel, Aluminium, GRP / Fibreglass, Existing paintwork0.5 L · 2.5 LView
ZN-4202K Acrylic Hardener2KSteel panel, Galvanised steel, Aluminium, Plastic, GRP / Fibreglass, Existing paintwork0.5 L · 2.5 LView
ZN-4302K MS Hardener2KSteel panel, Galvanised steel, Aluminium, Plastic, GRP / Fibreglass, Existing paintwork0.5 L · 2.5 LView
ZN-4402K HS Hardener2KSteel panel, Galvanised steel, Aluminium, Plastic, GRP / Fibreglass, Existing paintwork0.5 L · 2.5 LView
Chemistry and technology

Isocyanate hardeners

The hardeners are aliphatic polyisocyanates that react with the hydroxyl groups in the acrylic resin. Their reactivity, adjusted for each system, determines pot life, drying speed and the final hardness of the film.

Isocyanates can cause respiratory sensitisation. Use an air-fed mask, chemical-resistant gloves and safety glasses. Environment, health and regulatory guide

  • Why system-specific?

    Standard, MS and HS resins differ in their reactive group content. The matching hardener ensures the correct NCO/OH balance and the expected film properties.

  • Moisture sensitivity

    Isocyanate also reacts with moisture in the air. Cloudiness, gelling and bubbles (CO₂) forming in the mix are signs of this.

  • Pot life

    The reaction starts on mixing and speeds up as the temperature rises. A mix that has reached the end of its pot life cannot be made usable again by adding thinner.

  • Storage

    The lid must be closed tightly immediately after each use, and the product stored in its original container in a cool, dry place.

Frequently asked

Questions about Hardeners

Answers to the most frequently asked questions about this product group.

How can I tell if a hardener has deteriorated?

Hardener that has come into contact with moisture turns cloudy, forms a sediment or gels. Product in this condition must not be used; close the container tightly after every use.

Can I use clear coat hardener in primer?

This is not recommended. Use ZN-410 2K Acrylic Primer Hardener for primers and, for clear coats, the hardener matched to the clear coat.

What precautions are needed when working with hardeners?

Hardeners contain isocyanates. Suitable respiratory protection, nitrile gloves and eye protection must be used, and application must take place in a ventilated spray booth. See the Safety Data Sheet (SDS) for details.

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