I need that skin littlebit different, it will be a team skin, so without any logos and Black with Yellow details... Just a lay-out (I can put logos of team myself...)
1. Found the best possible image of the ABT Audi .... see pic
2. Using the Magic Wand tool and shit key I then went and selected all of the black markings.....
3. After all of it was selected i made a new layer and simply filled the layer with black paint.
4. This gave quite a similar effect
5. I then selected the best area with most randomly spaced marks using the circular selection tool.. Hold shift + alt to make a perfect circle...
6. Then I went to edit> define brush preset, this has now made the selected pattern into a brush.
7. go to the brushes selection and it should be near the bottom..
8. I then just painted randomly the patterns, I just did it very quickly so it doesnt look quite right, but what you can do is, using the rubber you can erase some of the unwated marks untill you are left with something that looks very similar. In my screenshot I just painted, havent eased them yet so it looks very busy and messy.
Final though, this was the fastest and easiest way I thought of, It was rushed and can be perfected, will work on it a bit more. I can also then send you the brush if you want... I will make a proper skin of it later, now its time to eat