Thanks a lot Gentlemen!
it is time for some color, not? Ok, white is not really a color, but you know what I mean.
OK, so first step was black primer
then a mottling with a quite dark grey
and again some mottling of middle grey
after that a quite light grey with a mask, that mask you can see at the upper left corner
and in the end some misted layers of an off white
a part cloesly
so, was it worth it? not sure, i'm not finished yet, but most probably the last two steps woud be enough ...
Thanks for looking in
Cheers
Martin