Pro Range Car/Boat Fibre Fibreglass Bridging Compound Premium Body Filler - Fibre #4
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Product Information
Full details
Pro Range Fibre #4 is a high-performance bridging compound engineered for automotive and marine professionals and serious DIY restorers who require a robust solution for structural repair. It excels at filling deep holes and reinforcing compromised sections of steel and GRP surfaces with a permanent, high-strength bond. While it provides an exceptional structural foundation, users should note that as a coarse-textured fibreglass filler, it is intended as a base layer and will require a finer finishing putty to achieve a smooth, paint-ready surface.
All features
| Model Part Number | Fibre #4 |
|---|---|
| Brand | Pro Range |
Extended Product Information
FAQs
Can I use this on aluminum body panels?
Pro Range Fibre #4 is designed for steel and GRP. For aluminum, ensure the surface is properly keyed and consider using an epoxy-based primer first for maximum adhesion.
Does this product require a finishing putty?
Yes, because the fibreglass strands leave a textured finish, a standard finishing filler is required to achieve a smooth surface for painting.
Is it waterproof?
Yes, it is formulated to be water-resistant, making it suitable for marine repairs and external automotive components.
How long should I wait before sanding?
Typically, the filler will be sandable within 20-30 minutes, though this varies based on ambient temperature and humidity.
Can I apply this over paint?
No, you must sand back to bare metal or exposed GRP laminate to ensure the bond is secure and permanent.
Troubleshooting
Filler is not curing/staying tacky.
Ensure the ratio of hardener is correct and that the components were mixed thoroughly. Cold temperatures will also delay curing.
Filler has pulled away from the edges of the repair.
The surface may have been contaminated with oil or silicone; degrease thoroughly and re-sand to provide a better key.
Surface is very rough after sanding.
Fibre #4 is a bridging filler, not a finishing filler. Apply a thin layer of fine-grade finishing putty over the top once the base is cured.
Pros and Cons
Pros
- Superior structural strength compared to standard polyester fillers
- Excellent adhesion to both metal and fiberglass surfaces
- Ideal for bridging holes rather than just surface smoothing
- Durable enough for marine environments
- Minimizes the risk of cracking in repaired areas
Cons
- Texture is too coarse for a direct paint finish
- Requires sanding and a finishing glaze to level
- Short working time due to fast-curing formula
- Strong chemical odor requires well-ventilated workspace
Setup, Compatibility & Care
Before application, ensure the substrate is clean, dry, and free from oil, grease, or loose debris. For steel surfaces, scuffing the area with 80-grit sandpaper will significantly improve mechanical adhesion. For marine GRP, ensure any gelcoat layers have been sanded back to expose the laminate structure.
- Prepare the surface by sanding and degreasing.
- Mix the Fibre #4 compound with the recommended hardener ratio as indicated on the container.
- Apply immediately using a spreader.
- Store the container in a cool, dry place out of direct sunlight.
- Keep the lid tightly sealed to prevent the styrene components from evaporating, which can cause the product to harden in the tin.