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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.
| Model Part Number | Fibre #4 |
|---|---|
| Brand | Pro Range |
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.
Yes, because the fibreglass strands leave a textured finish, a standard finishing filler is required to achieve a smooth surface for painting.
Yes, it is formulated to be water-resistant, making it suitable for marine repairs and external automotive components.
Typically, the filler will be sandable within 20-30 minutes, though this varies based on ambient temperature and humidity.
No, you must sand back to bare metal or exposed GRP laminate to ensure the bond is secure and permanent.
Ensure the ratio of hardener is correct and that the components were mixed thoroughly. Cold temperatures will also delay curing.
The surface may have been contaminated with oil or silicone; degrease thoroughly and re-sand to provide a better key.
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.
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.
