A combination includes a composition providing corrosion resistance for application to a post-construction material, and a post-construction material, wherein the composition is applied to at least one surface of the post-construction material after the post-construction material has hardened. The composition may include an effective amount of a thinning agent, e.g., isopropyl alcohol, ethanol, xylene or similar composition. The composition may be an aqueous solution of a metal salt of a dioic acid. The post-construction material may be reinforced or unreinforced concrete. The post-construction material may be a concrete-containing structure, and the composition may be applied to an exterior surface thereof.