The core business of Core Molding Technologies is fiberglass reinforced plastic and sheet molding composite materials. Through compression molding, sprayup, hand layup, and vacuum-assisted resin infusion molding, the company makes truck components (air deflectors, fenders, hoods) and personal watercraft parts (decks, hulls, and engine hatches). It divides its operations into two segments: Products and Tooling. Navistar International accounts for one-third sales, and other major customers include heavy-duty truck manufacturers Volvo and PACCAR. The company's sales are confined to North America.