[Sci-Fi]

The easiest way would be to use a synthetic wax/polish and reapply on monthly basis. Use a metal or billet polish to brighten it up occasionaly.

Next option would be to use a clear coat paint. It should be noted that a clear coat paint has a slight yellow tint to it and you would need to polish the clear coat paint (after it cures) to get the maximum shine and then wax it (synthetic or carnuaba wax). Also, some castings are porous and you may experience out-gassing and/or bubbling in or under the paint.

On many show cars, billet, polished, and chrome parts are powder coated with gloss clear. Vintage cars also use clear powder coating (various clear powders are available: gloss, semi-gloss, and satin) on brake parts (drums, rotors, wheels, etc.) to prevent rusting and retain the OEM or restored look. Powder coating can handle heat and flexing (crack resistent). It's baked on at 400° for about 20-30 minutes or until flow out occurs and you end up with a coating about 3-4 mil thick (twice the thickness of typical paint coatings). Many performance brake calipers are powder coated.