"Formby's Tung Oil is by far the best metal finish I've used. It is very easy to apply (or remove), dries quickly, and seems to have "miracle" restorative properties when applied to faded damascus barrels.
Place a long wooden broom handle in the breech of one tube and tighten the handle in a vice so the barrels are horizontal. Wet a 4 inch square cloth patch with the oil and wipe it on, moving quickly. It might help to rotate the tubes using another wooden dowel in the muzzle of the other barrel. One patch should do both barrels. Let dry for 3 to 4 days then admire your work."

Make sure you use in very thin coats, and insure the cloth is lint free.

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