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Whether you’re tackling a flat roof project or a DIY repair, understanding how to correctly use fibreglass resin is essential for a durable and professional 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 mixing 2% catalyst (hardener) with its polyester resins 1. This applies to both Flexible Roofing Resin and Lloyd’s Approved Resin, which are commonly used in roofing and general fibreglass applications. For example, if you’re using 1 litre of resin, you should add 20ml of catalyst.
Yes, adding too much hardener can cause the resin to cure too quickly, leading to cracking, excessive heat, and a brittle finish. It may also reduce the working time, making it harder to apply the resin smoothly. Always stick to the recommended 2% ratio unless advised otherwise for specific temperature conditions.
For every 1 litre of resin, you should add 20ml of catalyst. This ensures optimal curing and performance. Tricel supplies catalyst with standard resin sizes to make this process straightforward 1.
If you under-catalyse the resin, it may not cure properly, resulting in a sticky or soft surface that remains tacky and vulnerable to damage. This can compromise the structural integrity of your fibreglass application and may require complete removal and reapplication.
Fibreglass resin typically does not adhere well to oily, waxy, or contaminated surfaces. It also struggles to bond with certain plastics like polyethylene and polypropylene. For best results, always ensure the surface is clean, dry, and lightly abraded before applying resin.
Yes, you can use resin alone for sealing or coating purposes, but it won’t provide the structural strength that comes from combining it with Chopped Strand Matting or other fibreglass cloths 1. For repairs or builds requiring durability, the cloth is essential.
If the previous layer has fully cured, sanding is recommended to ensure good adhesion between layers. However, if you’re applying the next layer while the previous one is still tacky, sanding may not be necessary. Always follow best practices for surface preparation to avoid delamination.
Curing time depends on temperature and catalyst ratio, but typically, Tricel’s fibreglass resin will cure within 24 hours under normal conditions 2. It’s important to allow full curing before applying topcoat or exposing the surface to stress.
Tricel’s technical team is available to support you with expert advice and product recommendations. Whether you’re a professional contractor or a DIY enthusiast, we have the materials and guidance to help you succeed.
Fibreglass Resin FAQs Mix Ratios, Hardener Use & Application Tips Whether you’re tackling a flat roof project or a DIY repair, understanding how to correctly use fibreglass resin is essential for a durable and professional finish. At Tricel Composites, we
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