How to render a textured powder coated finish

Hi Folks. Ive been struggling for a while to try and create a textured powder coat finish (in WF5.0 with ARX).

Cant seem to get close to it.

Any tips on creating this type of material?

or

Is there a standard material / texture that could be used, that would allow me to just change the RGB for colour variations?

Image attached to show you what Im trying to acheive - the colour doesnt matter at this point - Im just trying to achieve the textured look.

Thanks in advance

Mark