Paint, paint and more paint. Grab a dark metallic grey that I liked from the local auto paint shop.
Added some black top coat to the grey to get this colour for the front fender. There was some left over in the mix for the rear fender.
Used some open weave fabric to achieve this effect – same paint as the fender was used and lightly sprayed with the gun. It’s a little uneven – but I have a plan to sort this out.