Hand layup is the oldest and simplest method used for producing reinforced plastic laminates. Capital investment for hand layup processes is relatively low. The most expensive piece of equipment typically is a spray gun for resin and gel coat application. Some fabricators pour or brush the resin into the molds so that a spray gun is not required for this step. There is virtually no limit to the size of the part that can be made. The molds can be made of wood, sheet metal, plaster, and FRP composites.
In a particular hand layup process (otherwise known as wet layup), high solubility resin is sprayed, poured, or brushed into a mold. The reinforcement is then wet out with resin. The reinforcement is placed in the mold. Depending upon the thickness or density of the reinforcement, it may receive additional resin to improve wet out and allow better drape ability into the mold surface. The reinforcement is then rolled, brushed, or squeegeed to distribute the resin uniformly, to remove entrapped air and to compact it against the mold surface.