There is a wide variety of manufacturing process for the reinforced plastic products. For example, the hand lay-up process, filament winding, pultrusion process, vacuum bagged method, etc. In the different process, glass fibers can exist in different forms. Such as fiberglass matting, fiberglass fabric, chopped strand mat, glass filaments, and so on. Also, you can choose different resin to get different FRP properties.
The hand lay up can help produce large and complex shape products, such as boat hull. Impregnating the glass filaments with polyester and vinyl ester resins, and winding them on the core with certain rules. After solidification and mold release, you can get the final product. This is the filament winding process. In addition, the core material is generally aluminum, steel or wood. FRP spray up method is also used for complex shapes fiberglass composites. It uses the chopper gun and sprays the resin system with chopped strand mat or gun roving from the different nozzle.