2K
Clear CoatZN-330
2K Acrylic HS Clear Coat
High-solids 2 : 1 HS clear coat for top-quality repairs; delivers high film build in 1.5 coats, glass-like depth and superior scratch resistance.
View product
Hardener · ZN-440
2K HS Hardener
Premium hardener specially formulated for ZN-330 HS clear coat; delivers lasting gloss, depth and maximum surface hardness.
- 2K · Two-component
- Steel panel
- Galvanised steel
- Aluminium
- Plastic
Packaging
0.5 L · 2.5 L
Overview
What is 2K HS Hardener?
ZN-440 2K HS Hardener is an aliphatic isocyanate-based hardener specially formulated for premium high-solids (HS) clear coat systems. In the Zenova system it is paired with ZN-330 2K Acrylic HS Clear Coat and used at 2 : 1 by volume. Designed to work in harmony with the low solvent content and high resin content of HS clear coats, it helps to retain the depth and fullness of the clear coat after curing.
A film cured with ZN-440 forms a dense cross-linked structure and reaches maximum surface hardness. This hardness increases resistance to the fine scratches caused by washing and everyday use, while keeping the gloss for longer. The aliphatic structure limits the tendency to yellow under UV light, so depth and colour purity are retained for a long time, especially on light-coloured vehicles.
To mix, add 1 part by volume of ZN-440 to 2 parts of ZN-330; if the viscosity needs adjusting, use a maximum of 5% ZN-510 Acrylic Thinner. As ZN-440 is specific to the HS formulation, it must not be used with standard or MS clear coats. For the best results in premium repair systems, it is important to add the hardener at exactly the right ratio using a graduated cup or scales, and to close the container tightly after each use.
Key features
- Special formula for ZN-330 HS clear coat
- Maximum surface hardness and scratch resistance
- Lasting gloss and glass-like depth
- Aliphatic structure that limits yellowing
- Consistent, predictable results in premium repairs
Technical specifications
Technical data
Values are typical at 20 °C and 65% relative humidity. Please review the product's current Technical Data Sheet (TDS) before application.
| Type | Aliphatic isocyanate-based hardener dedicated to HS systems |
|---|---|
| Compatible product | ZN-330 2K Acrylic HS Clear Coat |
| Mixing ratio (by volume) | 2 : 1 (clear coat : hardener) |
| Effect | Maximum surface hardness, lasting gloss and depth |
| Resulting pot life | Approx. 1.5–2 h at 20 °C with ZN-330; shorter at higher temperatures |
| Moisture sensitivity | High; keep the container tightly closed and do not use cloudy or gelled product |
| Appearance | Clear liquid, colourless to pale yellow |
| Packaging | 0.5 L, 2.5 L |
Pack sizes
- 0.5 L
- 2.5 L
Technical documents
Our technical team will send the Technical Data Sheet (TDS) and Safety Data Sheet (SDS) you request by email.
Drying times vary with temperature, humidity, film thickness and air circulation. Consult our technical team about special conditions.
Application
Step-by-step application
The recommended application sequence for a professional result.
- 01
Preparation
Stir the ZN-330 thoroughly in its tin; before opening the hardener tin, clean around the lid to prevent dust and moisture from getting in.
- 02
Measuring
Using a graduated mixing cup or scales, add 1 part by volume of ZN-440 to 2 parts of ZN-330.
- 03
Thinning and mixing
If the viscosity needs adjusting, add a maximum of 5% ZN-510 Acrylic Thinner; stir until the mixture is uniform and strain it into the spray gun.
- 04
Use within the pot life
Use the mixture within approximately 1.5–2 h at 20 °C; the pot life is shorter in hot conditions. Do not store leftover mixture in a closed container.
- 05
Closing the container
Immediately after use, wipe the rim of the tin and close the lid tightly. Make sure an opened container is used up within a short time.
Storage and safety
- Reacts with moisture: close the container tightly after each use; do not use product that has turned cloudy, formed sediment or gelled.
- Store in the original container at 5–25 °C in a cool, dry place, away from direct sunlight.
- Flammable liquid: keep away from heat, sparks and open flames; ventilate the work area well.
- Contains isocyanates; may cause an allergic reaction. Wear suitable respiratory protection, chemical-resistant gloves and eye protection; refer to the product's Safety Data Sheet (SDS) for full details.
System compatibility
Products used together
Zenova products tested in the same system as this product, which give the best results together with it.
1KThinnerZN-510Acrylic Thinner
Balanced-evaporation thinner that brings 2K acrylic paints, clear coats and primers to ideal spray viscosity; reduces orange peel and ensures even flow.
View product- 1KThinnerZN-520
Blending (Fade-out) Thinner
Blending thinner that makes the transition between new clear coat and existing paintwork invisible in spot repairs; melts in overspray edges and eases polishing.
View product - 1KThinnerZN-530
Surface Cleaning Thinner
Removes grease, silicone, wax, tar and sanding dust before painting, priming and filling; cuts the risk of silicone craters (fisheyes) for more reliable adhesion.
View product
Frequently asked
Questions about 2K HS Hardener
Knowledge Centre
Related articles
Health, Safety and Environment
6 min read
Health and Safety in the Paint Shop: Protecting Against Isocyanate and Solvent Exposure
Health and safety in the paint shop: PPE against isocyanate and solvent exposure, ventilation, fire precautions, waste management and a checklist.
Read articleProduct Knowledge
6 min read
The Differences Between HS and MS Clear Coats: Which Is Right for You?
HS vs MS clear coat: which one suits your work better in terms of solids content, film thickness, gloss, polishing and cost?
Read articleGet a price quote for ZN-440
Add the product to your quote list or contact our sales team directly, and we will prepare a quote for the pack size and quantity you need.