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Whether you’re working on a flat roofing system or tackling a DIY repair project, using fibreglass resin correctly is essential for achieving a strong, long-lasting finish. At Tricel Composites, we supply high-quality fibreglass materials across Ireland—and we’re here to answer your most frequently asked questions.
Tricel recommends a 2% catalyst (hardener) ratio for all polyester resins. This applies to both:
Example:
1 litre of resin = 20ml of catalyst
Maintaining this ratio ensures proper curing and optimal performance.
Yes. Adding too much hardener can cause:
For best results, always stick to the recommended 2% ratio, unless adjusting slightly for extreme temperature conditions.
For every 1 litre of resin, add:
20ml of catalyst
Tricel conveniently supplies catalyst with standard resin pack sizes to make measuring easy.
Under-catalysing can prevent the resin from curing properly, leading to:
In many cases, improperly cured resin will need to be removed and reapplied.
Fibreglass resin struggles to adhere to:
Best practice:
Always ensure the surface is:
Yes—but with limitations.
Using resin alone is suitable for:
However, without Chopped Strand Mat (CSM) or fibreglass cloth, the material will lack structural strength.
For repairs or load-bearing applications, always use reinforcement.
It depends on timing:
If the previous layer is still tacky:
→ No sanding required
If fully cured:
→ Light sanding is recommended to ensure proper adhesion
Skipping this step can lead to delamination between layers.
Curing time varies based on temperature and catalyst ratio, but typically:
Always allow full curing before:
Whether you’re a contractor or DIY enthusiast, Tricel’s technical team is here to help with:
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