Northern Technologies International develops and markets products and services either directly or via a network of subsidiaries, joint ventures, independent distributors, and agents. Co.'s primary business is corrosion prevention products and services, marketed mainly under the ZERUST® brand. Co. is selling its proprietary ZERUST® products and services to the automotive, electronics, electrical, mechanical, military, and retail consumer markets and has also expanded into the oil and gas industry. Additionally, Co. markets and sells a portfolio of proprietary bio-based and certified compostable (fully biodegradable) polymer resin compounds and finished products under the Natur-Tec® brand.