I used Micro Mesh polishing cloths to polish a white metal prop blade on a kit once. The final outcome looked like chrome. I did not seal it in any way after I was finished. That was over ten yeats ago and it is still chrome looking. It has been touched hundreds of times and has not dulled a bit or got finger prints on it.
Berny
Phormer Phantom Phixer
On the bench
TF-102A Delta Dagger, 32nd FIS, 54-1370, 1/48 scale. Monogram Pro Modeler with C&H conversion.
Revell F-4E Phantom II 33rd TFW, 58th TFS, 69-260, 1/32 scale.
Tamiya F-4D Phantom II, 13th TFS, 66-8711, 1/32 scale. F-4 Phantom Group Build.