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Have you considered prints on metallic paper instead of actually printing on metal? There is a huge difference in cost.
But, I haven't found metallic paper as neutral as metallic (which can be either neutral or not). If you've got a strong amount of neutral in the scene, I didn't care for metallic paper (maybe there are more neutral ones out now).
The cost is VERY DIFFERENT for metallic paper vs. metallic ... but unless someone knows of a metallic paper that is neutral, I can understand the desire for metallic ... i.e. they really are two different products, imo.