2K
FillerZN-120
Fibreglass Filler
High-strength, glass-fibre-reinforced 2K structural filler. Ideal for deep dents, tears, small holes and repairs to GRP/fibreglass parts.
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Filler · ZN-125
Micro Fibreglass Filler
2K filler reinforced with micro glass fibres, combining the strength of a fibreglass filler with a smooth, pore-free surface and much easier sanding.
- 2K · Two-component
- Steel panel
- Aluminium
- GRP / Fibreglass
- Existing paintwork
Packaging
1 kg · 2 kg
Overview
What is Micro Fibreglass Filler?
ZN-125 Micro Fibreglass Filler is a two-component polyester filler reinforced with much finer micro glass fibres instead of the long fibres found in conventional fibreglass fillers. This structure retains the strength provided by fibre reinforcement while giving the filler a denser, more homogeneous texture. The result is a balanced, versatile repair filler that can be used at both the filling and the levelling stage.
The micro fibres leave no noticeable fibre texture on the surface; the cured filler forms a smooth, pore-free finish. It is much easier to sand than conventional fibreglass fillers, which reduces shaping time and abrasive paper consumption. Its flexible, durable structure offers a hybrid solution for areas exposed to vibration and slight flexing, such as door bottoms, wing edges and thin panels.
ZN-125 is positioned to fill the gap between the long-fibre ZN-120 Fibreglass Filler and ZN-110 Universal Polyester Filler. It can be used on its own for medium-depth damage, and on surfaces with a low tolerance for imperfections it can be finished with a thin coat of ZN-130 Soft Finishing Filler. After sanding, the surface is prepared for the paint system with ZN-210 4+1 Acrylic Primer Filler or ZN-220 5+1 HS Acrylic Primer.
Key features
- Fibreglass-filler strength from micro glass-fibre reinforcement
- Much easier to sand than conventional fibreglass fillers
- Smooth, pore-free surface; less finishing work
- Crack-resistant on surfaces subject to vibration and flexing
- Can be used as both a filling and a levelling coat
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.
| Components | 2K – polyester filler reinforced with micro glass fibres + BPO hardener paste |
|---|---|
| Mixing ratio | 100 : 2–3 (by weight); BPO hardener paste included in the pack |
| Pot life (20 °C) | 4–6 min |
| Ready to sand (20 °C) | 20–30 min |
| Ready to sand (short-wave IR) | 3–5 min |
| Recommended coat thickness | Max. 4 mm per coat |
| Recommended abrasives | P80–P120 for shaping, P180–P240 for finishing (dry) |
| Colour | Light green |
| Density | Approx. 1.6–1.8 g/cm³ |
| Application tool | Metal or plastic spreader |
Pack sizes
- 1 kg
- 2 kg
Colour
Light green
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
Surface preparation
Sand the repair area with P80 and feather the surrounding paint with P120–P150 to a smooth transition. On GRP surfaces, remove all gloss. Clean the surface with ZN-530 Surface Cleaning Thinner and allow it to dry.
- 02
Mixing
Add 2–3% BPO hardener by weight and mix on a clean board, folding and pressing, until the colour is uniform. Avoid whipping the mixture so that no air bubbles form.
- 03
Application
Start with a thin adhesion coat, then build up the fill at no more than 4 mm per coat. Use the mix within its pot life of 4–6 min.
- 04
Drying
Ready to sand after 20–30 min at 20 °C, or after 3–5 min with short-wave IR. Curing takes longer at low temperatures.
- 05
Sanding
Shape with P80–P120 and finish with P180–P240. Do not wet sand; use a guide coat to reveal any remaining unevenness.
- 06
Finishing and priming
If necessary, apply a thin coat of ZN-130 Soft Finishing Filler. Prime the cleaned surface with ZN-210 4+1 Acrylic Primer Filler.
Storage and safety
- Store in the closed original packaging at 5–25 °C in a dry, well-ventilated place.
- Shelf life in unopened packaging is typically 12 months; close opened tins tightly after use.
- Keep away from direct sunlight, heat and naked flames. The BPO hardener paste contains organic peroxide: protect it from heat and never dip a spreader contaminated with hardener into the filler tin.
- Work in a well-ventilated area when mixing and sanding; wear gloves, safety goggles and at least an FFP2 dust mask. Always consult 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.
- 2KFillerZN-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 - 2KFillerZN-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 - New2KFillerZN-150
3-in-1 Filler
2K filler combining strong filling, fine finishing and glass-fibre bridging in one hybrid formula. Enables fast repairs without a separate soft filler.
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Application systems that include this product
Frequently asked
Questions about Micro Fibreglass Filler
Get a price quote for ZN-125
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.