The gunmetal finish looks beautiful. It's metallic and dark-grey-ish, but it won't make the part look like metal. My results looked like it belonged more on a car than anything else. Perhaps it was the thinning ratio (deafult Tamiya 2:1), because apparently some people got that gritty gunmetal look.

Either way I'll still recommend this, because my results still looked beautiful (just different and less metallic than I expected).