Thank you !
The painting started, after Mr.Surfacer I started to paint the marking ( once again no decal will be placed, all will be painted ) and I tried something new, the most difficult thing is to shade and made panel lines weathered properly, so this is what I figured out. First a layer of white, then a grey shade over panel lines, drew the lines with graphite pencil and then several layers of white until I got the look I desired for. Works perfectly