Production of the products in the closed molds. First a gel coat is applied (it is also possible to manufacture a version without the gel coat). Next, structural layers are stacked in the mold (glass mats, matting synthetic mats in the form of a sandwich, Coremat, roving, etc.) as well as any strengthening and adaptations.
The use of compressed air, special clamps, cylinders or mechanical press provides the appropriate pressure to the mold. Accordingly, the presence of large closing forces and (during production) a pressure associated with the injection of the resin – the mold in this method must have adequate strength. We therefore use special pastes, composite materials and metal frame structures as well as strengthens. Once the mold is closed resin is injected through a special opening (s) formed in the mold.