A type of thermosetting plastic which can be used to fabricate a myriad of products by many techniques -open-mold casting, hand lay-up, spray-up, vacuum-bag molding, matched-metal-die molding, filament winding, pultrusion, encapsulation, centrifugal casting, and injection molding. Thermosetting polyesters have a range of physical properties from brittle and hard to tough and resistant to soft and flexible.