Now the Blacken -It is really an amazing product. I thought it blackened the metal Friul tracks but it doesn't really. they get some sort of rusty sandy tint which is spot on. With even some natural weathering here and there. When you rub the tracks with your fingers they start to get a darker color etc. Really good.
Now I just fixed them in place without overpainting them and started my usual painting process on the wheels. This is not bad looking, but nbot very precise and some work will be needed still.
Here is a view of the other side of the tank, with more weathering attempts on the lower part of the hull. Work in progress I say.