How to prevent oxidation of engraved metal keychain？

Here are some tips to help prevent oxidation (rust) on an engraved metal keychain:

Use a corrosion-resistant metal.

Stainless steel, nickel silver, or brass will hold up better than steel.

Apply a clear sealant.

Use a polymer or lacquer spray specifically made for metal protection. Reapply every 6-12 months.

Wax treatment.

Rubbing on a thin layer of paraffin or car wax forms a protective barrier and can be touched up as needed.

Oil lightly.

A small amount of mineral, motor, or silicone oil rubbed in the engraving helps displace water.

Dry completely.

Make sure the surface is fully dried after exposure to moisture to avoid rust spots.

Limit moisture exposure.

Avoid getting the keychain wet frequently from things like rain or sweaty hands.

Carry in a dry pouch.

Storing inside a small cloth or leather bag keeps it separated from loose change/keys.

Clean gently.

Use a soft cloth or small brush to remove dirt buildup from engraving where rust can form.

Check periodically.

Inspect engraving every few months and reapply protection treatments as signs of oxidation appear.

Keeping the engraving coated, dry and clean helps most metals maintain their shine and legibility over time.