Thanks a lot for all your nice comments :-)
I did a lot of work done during the last weeks but didnīt find enough time to make regular updates on this build blog. Sorry for this massive update ;-)
This is my planned painting/weathering sequenz for this UN vehicle.
- Cleaning the model
- Priming
- Basecolor white (Tamiya XF-2 white + Tam Buff)
- semi gloss acrylic coat overall (better flow for filter and washes)
- Decals
- Semi gloss acrylic coat over decals
- Painting details with variations of white color
- Filter overall (orange enamels or oils)
- Chipping with sponge and fine paintbrusch - acryl colors
- Pinwash with darkbrown enamles or oils
- Mounting tools, details and straps
- Streakings with "Balkan-Streaking-Mix" enamels
- Dusting with highly diluted "Balkan-Dust-Mix" Tamiya XF-57 und XF-52
- Dirt on lower hull, roadwheels and tracks with MIG pigments
- Grease, oilsstreaks an wet areas
Quite scary this to-do list ;-) ... so lets go on.
I will show this steps with some photos from my build.
Priming
After a good clean with isopropylic alcohol I primed the model with Vallejo Polyurethane Primer Grey. I sprayed it straight from the bottle and received a smooth finish. VERY IMPORTANT when using this primer: you must let it dry at least 48 hours or more to get it completely hard. If it has not dried enough you can peel it like a latex skin and you cannot sand the model if necessary.

Basecolor UN white
For my basecolor I mix Tamiya XF-2 flat white with a little bit of Tamiya XF-57 buff to break the bright white. Be careful not to use too much XF-57 otherwise your color get too creamy and look like vanilla icecream.

Semi gloss acryl coat
To protect the base color and get a smooth finish (for the decals and a better flow for washes and filters) I spray the model with a semi gloss acryl coat (Gunze Aqueous Hobby Color H 20 und H30 thinned with Tamiya X-20A thinner).
Decals
On the reference photo for this UN M109A2 you can only see the right and front side of the vehicle. On the door the UN marking in black letters is clearly visible. Because many soldiers are biased to symmetry I suppose there wase the same marking on the door on the left turret side ;-)Also a licence plate and a sticker with numbers is visible on the vehicles front.
Iīve got a lot of UN decals in my stash .. but as always I couldnīt find markings in proper shape and size. So I decided to print my own decals. I did this previously a couple of times with quite good results but this time I got in serious trouble ...
First I got horrendous printing results with three different printers (ink and laser).

Then I used a decal sheet from ipms austria which showed excellent printing results. I put the decals on the model and used also Microscale Micro Set and Sol. First it looked good, but after a couple of hours the edges of the decals furled up.


After some attempts to get the edges down I gave up and sanded the decals off from both turret sides with some skinny sanding sticks.

I had to go one step backward and repainted the sanded area :-(
Next day I tried another printer with better results, but this time the decal film was very thick. The result is not very good but I can live with it.
After the decal disaster I sealed the decals with a semi gloss clear coat.
Next Step is detail painting with color variation of the base color
I used Acryl Vallejo 918 & 837 with a fine brush to repaint some details with different beige colors. At the moment it looks ugly but after the following sequence of filters and washings it should look pretty good .... hopefully ;-)


Filter overall
To tone down and unify the different previous colors I used a thinned mixture of orange or sand enamels/oils. In this case I used a ready to use filter product from SIN.

Chipping with sponge and fine paintbrush
For a fast and fine chipping I first dipped pieces from a kitchen sponge into an acrylic color, removed the excess and dabbed it on the model. Then I repainted some areas with a fine brush.
First I made light chips with sand color but that didnīt look nice. So I used a darker mix (Acryl Vallejo Beige Brown & 822)for the chips and it looked better then. Deeper chips were made with Citadel Mithril silver because aluminum is used for the M109s hull and turret. You canīt find much rust on these vehicles I suppose.



Dark Pinwash
Next step was to bring more depth to the model. I did a dark pinwash with darkbrown enamel mix from MiG / Ammo diluted with white spirit. Seams, gaps, grills, handles, bolts etc. were reworked with this pinwash. After the pinwash dried some time (10 - 20 minutes) I used a clean flat brush moistened with white spirit to clean up and blend the pinwash. I also tried a make-up-sponge for clean up with good results. You can "borrow" it from your wifes / girlfriends / sisters vanity case or make-up-box ;-)

Mounting tools, details and straps
I painted all the tools with different acrylic colors from Vallejo, Andrea and Citadel. For the mounting straps I used medical Leukosilk tape because of its nice texture. I painted it with sand color and cut thin strips. Fasterens were made from PE (Black Dog Fasteners and Buckles E35001) ... a very useful set.
Unfortunately the Leukosilk tape strips are a little bit too thick and very sticky. So it was not easy to get them through all fasteners openings and through the footman loops. I had to impovise a lot ... notice for my next build ... Tamiya Tape is much easier to handle :-)

First glueing the straps in to place ....

... then glueing in the tools and finally wrapping the straps around.
I think the straps look much better than the chunky casted on plastic straps. Also the dust cover of the gun is substituted with Leukosilk tape because I didnīt want to use the kits vinyl part.
