Acid Vapor Neutralizer Rust Preventive Spray, 44011, Protection from PVC Resins is engineered to protect stored molds and dies from corrosive attack by hydrochloric and hydrobromic acids, as well as most common atmospheric corrosives and fingerprint acids. Widely used in the manufacturing of PVC and flame-retardant resin products, this rust preventive is a one-step solution that doesn’t require coating with a separate acid neutralizing product first. Duration of protection that is offered is dependent on amount of PVC and flame-retardant being molded.