A water based, water dilutable corrosion inhibitor concentrate for ferrous and non-ferrous metals. A special inhibitor provides added protection for soft metals such as copper and brass. It forms a clear solution and leaves a thin, uniform rust inhibiting film which will provide up to 6 months indoor storage protection on in-process and finished parts and assemblies. Its inhibiting film is paintable with no adhesion problems. It can also be used as a protectant in open or closed circulating systems. Paint adhesion test recommended.