What is the primary method of processing polyester resin?

The primary method of processing polyester resin is through pouring it into a mould. This technique is particularly effective because polyester resin is often used in applications that require producing complex shapes and detailed designs, which can be easily achieved by pouring the liquid resin into a mould. Once in the mould, the resin can cure and harden, taking the shape of the mould.

While other methods listed, like compression moulding and injection moulding, are also used for processing various plastics, pouring into a mould is especially suited for the nature of polyester resin and its application in industries like composites, where large and intricate components are desired. This method also facilitates the incorporation of reinforcing agents like fiberglass, which is commonly added to enhance the mechanical properties of the final product.