While at the CTI, Tsai headed a project to develop the technology for making breathable waterproof fabrics. At that time, he says, few manufacturers in Taiwan were both interested in the technology and competent to apply it. Later, when his team had developed the process, many firms expressed an interest.
蔡秋雄回憶，他在紡研時就負責透濕防水技術的專案工作，當時有興趣而「識貨」的業者並不多；後來技術研發出來，聞風前來者眾多，沒想到推廣出去後，虧的虧，倒的倒，成果並不好。