Are you using any surface adhesion promoter? Seems the polypropylene (PP or no.5 plastic) resists most paints (good for a toy, eh?) so a coat of (typically) car bumper adhesion promoter is needed to ensure the paint stays stuck - especially when you're giving it follow-on weathering.
It should make a nice display item even just with a decent paint job.
Regards, Robert
Very cool effect indeed. It looks like a painting.
Great job
That looks absolutely fantastic for a quick repaint,
I'm eventually doing a serious detailed paint up on mine but the way yours has come out I would like to use the technique you are showing there for my spare one that I was going to sell at a toy fair I'm doing soon....
Do you let the charcoal dry completely? What happened to the metalic layer did it come off too?
In the pics, the model looks as though its been painted off-white. Its a great paint job. What colours did you use and in what order? Did you use actual charcoal?