A method of manufacturing a sheet material using fibreglass, such as glass fibres 802,803, fibre glass matting 801 and/or fibreglass webbing/tape 601, and polymer, such as polypropylene. The fibreglass is coated in liquid polymer and formed into sheet material 800, preferably by compression rollers 808,810. The material product is formed, by bending/folding, into desired shapes, such as box sections to form pallet/support platform sections. The formed sections can be fastened together, such as by elongate members passing through a series of aligned apertures between adjacent sections. The elongate members can be heat staked to the sections. Inserts can be used in the ends of the sections to provide additional rigidity and strength. Thus, a composite pallet/support platform can be manufactured in production line form.