I’m wondering what would be the best way to tackle the Olive Drab at the wing root? 
I would going for masking with white tac. I believe in the US a lot of guys use silly putty.
I second silly putty if you’re in the US.
Here in Oz, it ain’t easy to find, so i use U-Tac (ie, poster putty), only problem is, sometimes it leaves oil residue on the paint. From what i hear, silly putty does not.
Alternatively, cut a mask from painters tape and use that.
FYI - i’d stay clear of any form of liquid mask, they tend to lift/flake surrounding paint.
Further to last - is that an NMF finish (but for OD and Yellow?)
If so, then i’ll revise my last reponse as follows:
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paint the OD first;
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mask the area to remain OD;
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black gloss coat NMF areas; and
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NMF over that.
Having thought about it, it’s best to avoid masking over NMF if you can.
I would just like to say that silly putty will leave oily residue.
From what I remember in the pics it is a softer-edge scheme–not hard-edge…
When I did a scheme like this I used a hard edge and masked with tape. The tail on my bird was a soft edge however. It came out decent enough…



