What is the precise mechanism by which wax prevents corrosion on a chain, and how does it compare to other lubrication methods in terms of effectiveness? I understand that wax is often touted as a superior option for chain protection, but Im unclear on the specifics of how it interacts with the metal to prevent corrosion. Is it simply a matter of creating a physical barrier, or are there chemical reactions at play that help to prevent oxidation? Additionally, how does the type of wax used impact its effectiveness, and are there any scenarios in which a different lubrication method might be preferred?