Stoner Thin Film Rust Preventive A612 – Thin Film Rust Preventive A612 Rust Preventive provides short-term protection against moisture and oxidation. It prevents rust and corrosion from ruining exposed steel and stored metals overnight and on weekends. It allows you to ship or store parts, molds, tooling, or machinery without damage from rust, corrosion, or oxidation. Stoner Thin Film Rust Preventive is available through HeatSource.