A water based, water dilutable corrosion inhibitor concentrate for ferrous metals. 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 and is compatible with Loctite PMS-10ETM impregnation resin. Used as medium for N.D.T. and hydrostatic pressure or leak testing. Paint adhesion test recommended.