Gravity/wind weathering

I use a very dry almost empty brush and gently run it back across each panel section to create an old dripped/wind weather effect. 

It takes a while but I think it's worth it

This was the most annoying part yet. 

It gets really full of paint and it's hard to get out. Then it looks too dark!

Tip : use a different clean brush sprayed with your cleaning material and dab at it bristles facing towards it. This method removes it in random spats so you can choose how much remains, I found this gave a lot lighter weathering which looks better!