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Hand lay-up is a versatile method used in materials science, particularly for creating large structures like tanks, pools, and boat hulls. This process involves arranging mats of glass fibers over a mold. These fibers are then sprayed with a resin, such as unsaturated polyester dissolved in styrene monomer, which acts as the matrix. Polymerization, which solidifies the resin, can occur at room temperature or with heating. The structure can be compacted using a vacuum or a matching metal mold for higher production volumes.1

This technique is a type of polymer-matrix composite fabrication, where fibers are embedded in a polymer matrix to create materials with superior properties to their individual components.21

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