You could also have a look at shops for custom car parts, spoilers, wheels, accessories,... They usually have a lot of special metalic paints for plastics, and they should know how to get it to stick to plastic (how to grind, how to chemically activate the surface, apply primer, and so on).
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Labern 775
You can buy different spray cans to get this finish.
Search:
Hammertone Paint
Aged Iron Spray Paint
Stone Spray Paint
Or you could do what cloakfiend does and metal plate the plastic
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