2K
PrimerZN-210
4+1 Acrylic Primer Filler
High-build 2K acrylic primer filler: covers filled areas, does not sag, sands easily and creates a smooth, isolating base for the topcoat.
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Hardener · ZN-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.
- 2K · Two-component
- Steel panel
- Galvanised steel
- Aluminium
- GRP / Fibreglass
Packaging
0.5 L · 2.5 L
Overview
What is 2K Acrylic Primer Hardener?
ZN-410 2K Acrylic Primer Hardener is an aliphatic isocyanate-based curing component developed for Zenova's two-component acrylic primer range. It is formulated to be fully compatible with ZN-210 4+1 Acrylic Primer Filler, ZN-220 5+1 HS Acrylic Primer and ZN-250 Joker Multi-Purpose Primer. By reacting chemically with the primer resin, it turns the liquid primer into a durable, sandable, solid layer that is ready to be painted over.
Its fast reaction profile makes the primer sandable in a short time, reducing repair times. Complete curing minimises both sinkage of the primer over time and sanding marks showing through in the topcoat. The fully hardened primer sands easily and evenly without clogging the abrasive paper, which means cleaner, more controlled surface preparation for both dry and wet sanding.
ZN-410 is used at the ratio specified in the technical data of the primer it is combined with: 4 : 1 for ZN-210 and ZN-250, and 5 : 1 for ZN-220 (by volume). The mix is then brought to application viscosity with ZN-510 Acrylic Thinner at the ratio specified for the primer. Increasing the proportion of hardener does not speed up curing; on the contrary, it impairs the film properties, so it is important to use a graduated mixing cup or scales.
Key features
- Fully compatible with ZN-210, ZN-220 and ZN-250 primers
- Fast reaction; primer ready to sand in a short time
- Complete curing for a low risk of sinkage
- Easy-to-work surface that does not clog abrasive paper
- Consistent results with dry and wet sanding
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, solvent-borne hardener |
|---|---|
| Compatible products | ZN-210 4+1 Acrylic Primer Filler, ZN-220 5+1 HS Acrylic Primer, ZN-250 Joker Multi-Purpose Primer |
| Mixing ratio (by volume) | ZN-210 and ZN-250: 4 : 1; ZN-220: 5 : 1 (primer : hardener) |
| Effect | Fast, complete curing; excellent sandability |
| Resulting pot life | At 20 °C: 45–60 min with ZN-210 and ZN-250, 30–45 min with ZN-220; shorter at higher temperatures |
| Moisture sensitivity | High; reacts with atmospheric moisture, so the container must be kept tightly closed |
| 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
Check the ratio
Check the mixing ratio of the primer you are using: 4 : 1 for ZN-210 and ZN-250, 5 : 1 for ZN-220 (by volume). The ratios are based on the resin structure of each primer and must not be changed.
- 02
Measure and add
After stirring the primer thoroughly in its tin, add the correct amount of ZN-410 using a graduated mixing cup or scales; never measure by eye.
- 03
Mix and thin
Stir until the mixture is uniform; if necessary, bring it to the application viscosity specified in the primer's technical data with ZN-510 Acrylic Thinner.
- 04
Apply within the pot life
Use the prepared mixture within its pot life. Do not pour leftover mixture back into the original container or store it in a closed container.
- 05
Close the container immediately
After use, wipe the rim of the tin and close the lid tightly straight away. Contact with moisture causes the hardener to turn cloudy and gel.
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 (e.g. nitrile) 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.
- 2KPrimerZN-220
5+1 HS Acrylic Primer
Premium 2K HS acrylic primer that delivers high film build even in a single coat. Fills micro-pores, flows out perfectly and dries fast.
View product - 2KPrimerZN-250
Joker Multi-Purpose Primer
Hybrid 2K primer for use wet-on-wet or as a sandable primer filler. Adheres to aluminium, galvanised steel, factory coatings and existing paintwork.
View product 
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
Frequently asked
Questions about 2K Acrylic Primer Hardener
Knowledge Centre
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What Difference Do 4:1 and 5:1 Mixing Ratios Make in 2K Primers?
What do 4:1 and 5:1 mixing ratios mean for 2K primers? Measuring by volume, pot life, thinner addition and the effects of the wrong ratio explained.
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