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Primer · ZN-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.

  • 2K · Two-component
  • Steel panel
  • Existing paintwork
  • GRP / Fibreglass
Request TDS / SDS
Zenova ZN-210 4+1 Acrylic Primer Filler packaging

Packaging

1 L · 3 L

Overview

What is 4+1 Acrylic Primer Filler?

ZN-210 4+1 Acrylic Primer Filler is a two-component acrylic primer filler developed for professional body shops. It covers filled and sanded areas, sanding marks and minor surface imperfections, creating an even base before the topcoat. The 4 : 1 mixing ratio by volume is easy to measure in the workshop and gives a repeatable application every time.

Its high build reliably covers filler edges and fine scratches in just a few coats. Thanks to its sag-resistant formula, it holds its shape on vertical panels, even when applied at high film thickness. Once dry, it sands easily without clogging the abrasive paper. The closed, isolating film it forms prevents the underlying filler and existing paintwork from affecting the topcoat, providing a smooth, uniform base for basecoat and clear coat.

ZN-210 is mixed 4 : 1 by volume with ZN-410 2K Acrylic Primer Hardener and thinned by 10–20% with ZN-510 Acrylic Thinner. It is applied over surfaces prepared with ZN-110 Universal Polyester Filler or ZN-130 Soft Finishing Filler. After sanding, the system is completed with basecoat and ZN-310 2K Acrylic Clear Coat, ZN-320 2K Acrylic MS Clear Coat or ZN-330 2K Acrylic HS Clear Coat.

Key features

  • High build that conceals filler edges
  • No sagging on vertical surfaces
  • Sands easily without clogging the abrasive paper
  • Isolating film reduces the risk of filler marks in the topcoat
  • Easy-to-measure 4 : 1 mixing ratio
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.

4+1 Acrylic Primer Filler technical data
Product type2K acrylic primer filler
Mixing ratio (by volume)4 : 1 (primer : hardener)
HardenerZN-410 2K Acrylic Primer Hardener
Thinning10–20% ZN-510 Acrylic Thinner
Pot life (20 °C)45–60 min
Spray gun nozzle size / pressure (HVLP)1.7–1.9 mm / 2.0 bar
Number of coats / dry film thickness2–3 coats / 100–150 µm
Drying (20 °C / 60 °C)3–4 h at 20 °C; 30–40 min at 60 °C
SandingDry P400–P500; wet P800–P1000
ColourGrey

Pack sizes

  • 1 L
  • 3 L

Colour

Grey

Technical documents

Our technical team will send the Technical Data Sheet (TDS) and Safety Data Sheet (SDS) you request by email.

Request TDSRequest SDS

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.

  1. 01

    Surface preparation

    Sand filled areas with P180–P240 and the surrounding paintwork to be primed with P240–P320. Blow off the dust with compressed air and clean the surface with ZN-530 Surface Cleaning Thinner. We recommend first applying ZN-230 1K Fast Repair Primer to any bare metal spots exposed during sanding.

  2. 02

    Mixing

    Mix the primer 4 : 1 by volume with ZN-410 2K Acrylic Primer Hardener, then add 10–20% ZN-510 Acrylic Thinner. Use a mixing ruler and stir until the mixture is completely uniform.

  3. 03

    Application

    Apply 2–3 coats with an HVLP gun fitted with a 1.7–1.9 mm nozzle at approximately 2.0 bar inlet pressure. Allow 5–10 min between coats, until the surface turns matt.

  4. 04

    Drying

    Dry for 3–4 h at 20 °C or for 30–40 min at a part temperature of 60 °C. Drying takes longer with thick coats and at low temperatures.

  5. 05

    Sanding

    Apply a dry guide coat, then sand dry with P400–P500 or wet with P800–P1000. For metallic and pearlescent colours, use the finer end of the range.

  6. 06

    Topcoat

    Clean the surface with ZN-530 Surface Cleaning Thinner and wipe it with a tack cloth, then continue with the basecoat and clear coat system.

Storage and safety

  • Store in the original, closed container at 5–25 °C in a dry, well-ventilated area.
  • Shelf life in the unopened container is typically 12 months. ZN-410 2K Acrylic Primer Hardener is sensitive to moisture; close its container tightly immediately after use.
  • The product and its vapours are flammable; keep away from heat, sparks, open flames and direct sunlight.
  • Once mixed with hardener, the product contains isocyanates. When spraying, wear suitable respiratory protection (preferably an air-fed mask), gloves and safety glasses; always read the product's Safety Data Sheet (SDS).
System compatibility

Products used together

Zenova products tested in the same system as this product, which give the best results together with it.

  • 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-510 Acrylic Thinner packaging
    1K
    ThinnerZN-510

    Acrylic 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
  • 2K
    FillerZN-110

    Universal Polyester Filler

    Multi-purpose 2K polyester filler for dents and surface defects on steel, aluminium, galvanised steel and fibreglass; non-sagging, fast-drying and easy to sand.

    View product
  • 2K
    FillerZN-130

    Soft Finishing Filler

    Ultra-flexible, creamy 2K finishing filler for large surfaces and thin fills. Sands very easily without clogging the paper, leaving a flawless base for primer.

    View product

Application systems that include this product

Frequently asked

Questions about 4+1 Acrylic Primer Filler

How do I choose the right amount of thinner?

On filled or imperfect surfaces where high build is needed, thinning close to 10% gives a thicker film. When large surfaces call for a more fluid, even application, or when the ambient temperature is high, move closer to 20%. Going beyond this limit reduces filling power and sag resistance.

How long should I wait between coats?

At 20 °C, wait 5–10 min between coats, until the surface has lost its gloss and turned matt. Applying coats one on top of another without waiting traps solvent in the film; this extends drying and can lead to defects such as sinkage and pinholes.

Do I need to use a guide coat?

We strongly recommend it. When you apply a thin layer of guide coat to the primer and then sand it, coloured traces remain in any low spots. This means waviness and pinholes that cannot be seen with the naked eye can be found and corrected before the basecoat is applied.

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