The article here: http://dqscaleworks.blogspot.com.es/2013/05/the-black-technique-tiger-i-148-by-jose.html shows the book techniques clearly, and in some ways in more detail than the published book “Painting Guide for AFV” by José Luis Lopez Ruiz.
Here’s the weathering so far!The first step for all the pieces after the basic airbrush shading was completed was to take shades of grey paint, some darker, some lighter, heavily thinned (with Tamiya acrylic thinner) to make the splotches. After the splotches were dry I used an old sponge (that I’d warn down using it with Tamiya weathering master) to add patches of light, medium or dark grey. On some pieces like this, I wasn’t happy enough with my first pass so I used the grey paint on the airbrush just to minimize areas I wasn’t happy back to give me a clean area to have another go. So far, these techniques are very forgiving. I really wanted to rough up the shield. Although I like the hexagonal details, the flat surface would just look too boring without major work. The shoulder sections are very interesting with lots of nice edges to rough up with the paint effects. You can really see that I had a lot of fun with these pieces! And here’s all the pieces with a top coat of Future Finish, drying awaiting the next stage. What I’ll be doing next is using a thin oil-paint wash into the panel lines and to add depth to creviced areas.