Fiberglass yarn of Spray Up roving, the multiend roving for use in spray-up operations using standard or filled resin systems, is produced from a collection of continuous glass filaments gathered, without mechanical twisting into a single bundle. The filaments, which make up the bundles, are bonded together with a special size. Multiple bundles are then pulled together to form a strand which is wound into a tubeless package ready for use in customer application of which are producing GRP ships, sanitary ware, storage tanks and Hobas pipes, etc.