I haven't seen the article you are talking about, but have you tried things like Vallejo's liquid metals or some of the enamel metallics?
Most acrylic metallics have flakes that are out of scale with 15mm models, it makes them look less like real metals and more like cars painted with a metallic flake paint.
But vallejo's liquid gold and many enamels have a much smoother finish which I think would be more appropriate at 15mm scale.
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