Testor Corporation (or Testors) is an American manufacturer of tools and accessories for scale model kits. The business is based in Rockford, Illinois, and is part of RPM International. It was founded in 1929 and its products are made in the US and marketed to customers worldwide. The Testors' line of products include enamel paints, acrylic paints, aerosol paints, adhesives, brushes, cutting tools, commercialised under the Testors, Model Master, Spray Chalk, and Testors Craft brands. Beginnings Axel Karlson had been producing a product known as "Karlsons Klister" (klister being Swedish for glue), which was originally intended for use in the repair of women's stockings, but had quickly found use in other applications as well. In February 1929, Karlson convinced Nils F. Testor (1903–1967), then the manager of an F. W. Woolworth store in the Swedish district of Rockford, Illinois, to serve as office manager of his new enterprise. It was a relatively risky move for Testor, who began his career as a stockroom boy in Woolworth's Chicago store on State Street. Karlson's Klister ultimately proved unsuccessful and Karlson returned home to Sweden. Testor borrowed enough money to purchase the firm's assets and founded "The Testor Chemical Company". By the time Testor arrived, cobblers had become the product's primary market. Coming to the conclusion that the only way to save his new acquisition was to sell the product to additional markets, Testor renamed the adhesive "Crystal Clear Household Cement" and began marketing it to households as a general-purpose repair product, while continuing to sell a large quantity to shoemakers. Testor's actions proved to be successful, and by 1936 the company was able to expand its product line. Staying true to its status as a chemical corporation, hobbyist model cement and butyrate dope were introduced to the public. Four years later, Testor Corporation became a founding member of The Hobby Industry of America, an association of hobby parts suppliers and manufacturers. World War II Industrial production, necessitated by World War II, caused severe shortages of raw materials for manufacturers not directly involved in the war effort. In Testor's case, this manifested itself in difficulties acquiring the chemicals necessary to continue producing its line of adhesives and paints. As a result, the company was forced to branch out into other segments of the hobby market. To this end, Testor began producing static scale models of popular aircraft out of pinewood. These scale models