Hello!
Soviet AMT-series was based on cellulose lacquer. Literally they are given as "nitrotselljuloznye emalevye kraski".
German RLM paints were mainly phenolic resin - "Phenolharzverkochung in aromatischen Kohlenwasserstoffen (see:
http://www.kiroff.de/anwendungen/rlmflieg.htm , main Kiroff site:
http://www.kiroff.de ).
Are these paints compatible with each other? Can AMT be painted over RLM paints without cooking them? This is particularily interesting for me for another reason, namely were (or could) Finnish nitro enamels used over German paintwork in FinnAF Bf 109 and Ju 88 etc. I think only empirical test would give us the definitive answer. Hot lacquers could in theory (and in practice) painted in so thin layers that the solvent evaporates before it destroys the paint beneath.
If they are AMT-paints on the 4./JG 54 wreck it shoud be quite easy to test? Cellulose paints would lift with cellulose solvent. Don't think the same happens with phenolic paint. People at Firm Kiroff should know.
Another thing. Are we really sure that it was JG 54 which introduced the odd three-colour camo? And in field? The couple of JG 26 Fw 190 photos on Eastern Front do show odd three-colour camouflage too. Perhaps they were painted already at Feldluftpark/Factory or whatever? Before deliver/transfer to field units. Chronologically JG 26 odd-camo came first, I think. I speculated this in an earlier thread but it did not spark real discussion then:
http://forum.12oclockhigh.net/showthread.php?t=8108
My two cents,
Kari