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A family of cross-linkable acrylic copolymer resins - which uniquely have a thermoplastic “B-stage” that enables thermoplastic prepregs and semi-finished goods to be produced - is providing the opportunity to manufacture durable automotive interior trim-panel substrates with comparable or higher performance at lower weight and fewer processing steps than common thermoplastic and thermoset composites long used in such applications. Owing to their special chemistry and very-low initial viscosity, the acrylic copolymers provide excellent wetout / impregnation of fibrous or particulate reinforcements, facilitating the production of composite parts with very-high fiber volume fractions (FVFs). Loading levels as high as 70-90% have already been achieved with natural fibers. In the presence of heat and pressure, the material cross-links to form durable copolymers with excellent thermo-mechanical properties.