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Re: 109 K-4 RLM 84?
Whatever it was, it seems most unlikely to have been a new primer, as it was used on top of other paints - see the He 219 above. Given the state of German industry and the expected life of the aircraft, it would have made more sense to have abandoned the use of primer, as seen on US and Japanese production.
The lack of documentation may well be simply that - much was destroyed at the end of the war.
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