Professional Fibreglass Services Based In Lancashire. Moss Mouldings produces and designs a whole host of GRP mouldings and products for companies and individual customers. We are different because we handmake all of our GRP mouldings and products, which allows us to tailor bespoke designs for each and every client. It gives strength to the product that cannot be achieved when it is machine-made. We are extremely knowledgeable about which resins and fibres make the highest quality GRP fibreglass, and will adapt our source materials depending on your desired outcome.