There are only so many companies that have the capacity to blend these products. Duragloss might own their own manufacturing facility, I`m not sure. I know that Sal claimed to own a manufacturing facility but where it was has never been made public to my knowledge. I wouldn`t be surprised if it produced more than just Zaino. I got the impression that Zaino wasn`t the only product line that Sal was involved with. As with all these products, if it works then use it with confidence.