After I have glued the fuselage halves together, further problem areas showed up. There were some gaps between the halves and two areas were subisidiences could be found. A minor one on the left side behind the engine and a bigger one on the right lower fuselage.
I avoid the use of putty wherever possible or reasonable. So I filled the gaps with stretched sprue and the subsidiences with plastic sheet.
The use of thin plastic cement (Tamiya extra thin) makes it easy to bond the sheet and stretched sprue with the fuselage but it needs some time to cure. Therefore I will wait 48 hrs (I think 24hrs will be ok too) before I continue.