This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Protectosil" – news · newspapers · books · scholar · JSTOR (December 2010) (Learn how and when to remove this template message) This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: "Protectosil" – news · newspapers · books · scholar · JSTOR (December 2010) (Learn how and when to remove this template message)