Depends. On some kits, the texture is molded onto the plastic, in which case, the question should be; how can i get a good metallic finish.
Where there is no pre-molded texture, you can either try and replicate by shooting paint through mesh as they do for carbon fibre effect or use a textured foil in place of paint
i.e glue the foil onto the surface.
Some have used the foil from cigarette packets to good effect.
I think there's some textured foil intended for use as heat shielding that you can try.
You can also try and apply a similar texture to some Bare Metal Foil and use that.
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