Thanks for your comments, guys! So, after all that filling and sanding I could finally proceed to my favourite part of a build - painting! First, the vertical stabilizer was given a primer coat of Gunze Light Grey FS36622 - this helps with the coverage of Gunze's Gloss Yellow afterwards, and is not as annoying to airbrush as a "real" white would be.
After masking the yellow portions, all the upper surfaces were primed with Tamiya Flat Black. My thought process here was to get the whole camo scheme done before masking it off and painting the High Speed Silver underside. As I intend to use AK Xtreme Metals for that, I rather not have to mask the metal surfaces, so they will be done last.
I started by mottling the grey areas with Tamiya XF-54 Dark Sea Grey, roughly following the camo pattern. In the next step, a highly thinned layer of the same color was airbrushed, and there is your instant weathering! I deliberately did not follow any panel lines (i.e. pre-shading), as I find this type of weathering rather unrealistic and cartoonish.
Masking off the grey portions took ages. Well, days, but it felt like an eternity. As far as I know, the camouflage scheme on the real thing was applied using pre-cut masks with minimal tolerances, so I had to achieve hard edges while sticking to the pattern. I tried Tamiya's flexible masking tape, but found I did not like it, because it a) still does not bend as much as needed and b) the vinyl material tends to either lift or stick too well. So I used ordinary yellow masking tape, cut in 1mm strips and filled in with larger pieces. When this was finally done, I shot another quick layer of Flat Black to get rid of the grey overspray from the previous step.
For the green I used Tamiya XF-65 Field Grey. Yep, really. It is suprisingly close to the RAF color - sorry, colour, and with some weathering no one will notice the difference 😀
And of course one part had to come unglued...
9 attached images. Click to enlarge.