Race weathering

[majel]

I am building a race gt-r that I want to show in already raced form with a bit of road oil, grease, etc. I used a black wash on the chassis which came out fairly good, but my problem is: the body is gloss black. What can I use to show race/road grime that will show up on the black body?

[Corvette.Jeff]

maybe grey the area around the wheels somehow, where it looks like they have done alot of braking and tire spinning.

[Super Mario]

I know this is an old post but this was closest thing I could find to same question I have. 

How do you weather race cars, nascars, Le Mans, etc that look like they actually raced? Do you mist black or brown thru an airbrush over the entire car? How do you do road/race grime? 

[Rider]

On 2018-02-10 at 12:29 PM, Super Mario said:

I know this is an old post but this was closest thing I could find to same question I have. 

How do you weather race cars, nascars, Le Mans, etc that look like they actually raced? Do you mist black or brown thru an airbrush over the entire car? How do you do road/race grime? 

If you have an Air Brush of any type you can do most of what I did here. 

First off I put a very thin wash in the air brush. Sorry I have no idea what ratio, I mixed what I used for my Camel Porsche years ago. But when doing this stuff you want to build layers anyway. 

Set the car with the front end raised about an 1" 

Shoot the air brush at the front end varying the angles, up down, side to side etc etc, simulate air movment over the car. You can simulate air speed variances with different air volumes and psi. 

I do this a number of times, building up layers.

Then I go around with a very low psi and narrow fan playing with what my minds eye sees. I am curious to see what 1:1 NACA ducts actually look like. I can't imagine they have that much of a tarnished intake flow signature. 

I hope this helps you some what, good luck man. 

 

[Super Mario]

Thanks; I’ll use your Camel Porsche as a reference . I do have an airbrush and will try this out with different color washes.