Hello.
I have read the featured article on the letletlet-warplanes.com page of MR.Bradic about paint cans found near Diana's production Tunnels. Have you been able to decipher the labels of the cans? I would suggest the name of the Abfüller (bottler) of the paint is Andrä. To me as a native speaker this would be the only logical fitting. When i search the internet i find some companys from that branch and a strong tendency to Austria, which would fit to license production of Bf 109G-10/U4 by Wiener Neustadt Flugzeugwerke. Surely this is no real proof but a good suggestion.

regards
Kilian