The answers are “it would, except”, and “it does anyhow”. The metal coating will change, oxidize, or patina with time unless shielded from the atmosphere and elements by a protective coating. We use an extremely high-quality, marine grade, clear lacquer coating on every sign or plaque. “Marine Grade” means that the coating is designed to stand up to harsh coastal salt spray environments.
The lacquer is specifically designed to protect metal surfaces in extreme exterior environments. The manufacturer states that it “should give satisfactory exterior protection for at least ten years under normal conditions. Considerably longer life is expected.” Our experience has been very favorable with this fine and expensive product.
