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Polyester Resin

Polyester Resin

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Polyester Resins are a critical component of most fibreglass repairs.

Polyester resins are generally unsaturated, thermosetting resins that require an accelerant to provide a reaction that causes which will to cure or harden the resin. The accelerant comes in the form of a catalyst which is mixed into the resin in small amounts.

The catalysed resin is then applied to the Glass Fibre material. Once the resin cures, it will become rigid, giving the glass fibre material its strength.

Most Polyester Resins are quite pale in colour, viscous and made from a combination of styrene and polyester. Styrene is added to reduce the viscosity of the resin and aids the resin during the curing stage. They are mostly easy to handle (always wear gloves and personal protection), chemical resistant and cost-effective in comparison to other resins such as Epoxy.

Polyester Resins are used in various industries including Marine, Construction, Water Storage and Flat Roofing. The performance of the Polyester Resin can be modified with additives that will give UV Stability and increased flexibility for example. Clear casting resin is used in the art and craft industry to create many ornamental pieces, including jewellery, paperweights, model making, furniture tops including counter and table tops, and preservation of flowers and other organic materials. While the main product is transparent, it can pigmented to provide a creative finish to all crafted pieces.


Types of Polyester Resin


We have listed some of the Polyester Resins which are available from FibreGlassDirect.

All of the resins supplied at FibreGlassDirect are sold complete with catalyst. All of the resins mentioned with the exception of Clear Casting are mixed with 2% Catalyst. Clear Casting Resin is mixed with 1% Catalyst.


Low Cost General Purpose

Low-cost General Purpose Resin can be used in non-critical fibreglass repairs. This Polyester Resin is generally used to repair garden equipment, downpipe, and minor GRP bath repairs. Our Low-Cost General Purpose Resin is our most cost-effective range. Its re-blended consistency gives it a green/brown tinge. It is a great DIY resin for multipurpose, non-critical repairs, including downpipe/drainage repair.


Lloyds Approved

Lloyd's Approved Resin is a multipurpose Polyester Resin used in several applications. It is commonly used in potable water storage, boat repair, pond repair and forms part of our Standard Fibreglass Roofing Kits. It is available in a selection of sizes from 1-220kg and, therefore, suitable for all fibreglass projects, large or small.This resin has passed testing and quality checks by Lloyds to be approved on its register. It is approved for use in construction under the Lloyds Register Survey. We provide this best-selling resin for all kinds of fibreglass projects, including Potable Water Storage Tank construction and Fibreglass Pond Lining.


Flexible Roofing Resin

The Flexible Roofing Resin is a Polyester Resin with extra flexible properties. Roofing resin contains extra flexible additives in comparison to other Polyester Resins which provide additional properties which are very beneficial to flat roofing. It is perfect for Fibreglass Roofing projects as it aids flexibility concerning thermal contractions and expansions.  It will also aid movement in roof alignment due to settling. We provide this resin in our Premium Roofing Kits.


Clear Casting

As the name suggests, this resin is clear when applied and clear once cured. It works well for arts and crafts as well as encapsulations. Only 1% catalyst addition is required as this resin has a slower cure time. Too much catalyst will also tint the resin with a yellow colour. Clear casting resin is used in the art and craft industry in the creation of many ornamental pieces, including jewellery, paperweights, model making, furniture tops including counter and table tops, and preservation of flowers and other organic materials. While the main product is transparent, it can pigmented to provide a creative finish to all crafted pieces.


Isophthalic Resin

This is used where increased resistance to heat and chemicals is required. This resin is very popular in the marine industry. We also provide this resin in our Boat Repair Kits as standard.


Xtreme Surfboard Resin

Our Xtreme Surfboard resin is highly transparent and UV stable. This is necessary for a product that will spend most of its life outside! It also has great sanding properties and a quick cure time. We provide this resin as part of our Surfboard Repair Kit.