Hi Fernand,
you got me. I know, that the colour below the cheatline is unperfect. But I am only working with automotive paints, and there were not so many cars out there painted in silver/grey/blue... Luckily the photograph is little misleading. In reality the blue is some lighter than the blue of the cheatline, so it doesn't disturb that much.
I stopped the "heavy metaling" for a while, since I've been now in charge for father since 5 months....
Greets
Chris