Introduction: The spray-up method is a common technique in the construction of polyester composites, used to produce large and relatively complex parts with relatively low cost and production time. This method involves spraying a mixture of chopped reinforcing fibers and resin onto the mold surface, followed by consolidation and curing to form a solid composite part. Spray-up is typically used in industries such as construction, automotive, marine, and infrastructure to produce components like boat hulls, automotive body panels, and architectural elements.