Hi everyone!!!
Thank you (as always

) for such a great feedback... Im humbled and very happy at the same time for receiving such a great support
For Lance and Chris, here is a quick rundown to "my" technique on aluminium panels. I adjusted a bits to what I found couple years ago in "Modelar" magazine that comes out every month in Czech Republic in one article about WNW D.VII done by Zdeno Bugan (just to give credits to where I found it, not sure if it was his or someone else idea)....
Basically I apply any kind of surfacer (usually black or grey) based on what tone of "base" aluminium I want. Then I use gunze super metalics or Alclads that I create surface that is resistant to another weathering techniques. Then I use AK interactive chipping solution - I still didn't come with exact layers that result in desired finishes but Im trying to get there - usually I just apply few thin layers and let it dry. Then I apply matt varnish, I use Tamiya but more anything on acrylic base will do the job - I tried it with Gunze H, Valejjo and Micro Matt from Microscale. Then I use AK chipping solution as I did previously. After this I apply thin layer of any acrylic grey paint - in this scenario it was tamiya XF-20 but again, you can use any other acrylics. Then I let it dry and simply use brush and water to wash of those layers which creates the patern. Thats where it get tricky because quite often I get unrealistic surfaces so I just wash all of and re-do it again. After all this I use mix of oil paint, white spirit and Uschi's blitz dry to come that alive and make all that surface come alive. Then you can just play around it with more weathering techniques and use pigment fixer or varnish to lock that in.
Hope that makes bit of a sense. If not, just drop me a message and I will try to do my best to help
Cheerio
Lukas