If you need more structural strength or want to work with higher-density fabrics, check out our selection of fibreglass woven fabrics: available in weights from 48 to 300 g/m², with braided sleeves and Silionne fabric for special applications.
Frequently asked questions about fibreglass mat and veil
What is the difference between mat and woven fibreglass fabric?
Mat is made up of short fibres distributed randomly and bound together with a binder. It absorbs a lot of resin, conforms well to curved geometries and is more economical. Woven fabric, on the other hand, is made up of continuous interlaced filaments, which gives it greater mechanical strength and a cleaner finish. For quick reinforcement or simple moulds, mat is sufficient; for structural parts or quality finishes, woven fabric is the better option.
What is the surface veil for compared to the 300 g/m² mat?
They are complementary, not interchangeable. The 300 g/m² mat provides thickness, strength and body to the laminate. The 34 g/m² veil is a very thin layer placed at the beginning or end of the laminate to achieve a smooth surface, free from the mat weave pattern. The typical combination is: gelcoat → veil → one or two layers of mat → finishing veil.
What resins are compatible with fibreglass mat?
It is compatible with standard and isophthalic polyester resins, vinylester resins and lamination epoxy resins. For polyester resin laminates, 300 g/m² mat is the most common reinforcement. With epoxy resins, woven fabric is generally preferred for its greater mechanical efficiency, although mat also works correctly. The 34 g/m² veil is compatible with the same systems.
How many layers of mat do I need for my project?
It depends on the thickness and strength you are looking for. As a reference for hand laminates: one layer of well-impregnated 300 g/m² mat is approximately equivalent to 0.6-0.8 mm of cured thickness. For a standard mould shell, 2-3 layers are typically used. For a strong structural part, 4-6 layers. Always add a surface veil as the first or last layer if you need a smooth finish.
Do I need special protection when working with fibreglass?
Yes. Cut glass fibres release microparticles that irritate the skin, eyes and respiratory tract. Always wear nitrile gloves, safety goggles and an FFP2 or higher mask when cutting or sanding. Work in a well-ventilated space. The resin used to impregnate the mat also requires protection: gloves and ventilation during mixing and application.
