Commercial and Residential Window Film Solutions Serving The DC Metro Area Since 1969! General Solar Corporation has been providing high quality window film and glass coating installation for commercial & residential customers in the Washington Metropolitan area since 1969. At GSC we take the time to service the needs of our clients both ascetically and efficiently. From a modest home to a mansion or a storefront to a skyscraper, General Solar Corporation is the right choice for your window tinting needs.