Hand layup method is the oldest FRP molding method for making FRP GRP composite products. It does not require technical skills and machinery. It’s a way of small volume and high labor intensity, especially suitable for large parts such as FRP vessel. Half of the mold is usually used during hand layup process.
The mold have the structural shapes of the FRP products. In order to make the product surface shiny or textured, the mold surface should have a corresponding surface finish. If the outer surface of the product is smooth, the product is made inside the female mold. Likewise, if the inside must be smooth, then molding is done on the male mold. The mold should be free of defects because the FRP product will form the mark of the corresponding defect.