Which of the following is not a means of corrosion protection?

High-gloss paint finishes serve primarily as a topcoat that enhances appearance and provides a certain level of moisture barrier. However, they do not inherently protect against corrosion in the way that other options do.

In contrast, zinc-rich weld-through primers, for example, are formulated to provide a sacrificial layer that protects metal from corrosion during and after the welding process. Petroleum-based compounds can also create a protective film that prevents moisture contact with metal surfaces, thereby reducing the risk of rust. Acid-based metal cleaners are usually part of the preparation process and can help mitigate existing corrosion by cleaning and etching surfaces, making them more receptive to protective coatings.

Thus, while high-gloss paint finishes offer some aesthetic benefits, they are not specifically designed for corrosion protection like the other options mentioned.