Dear John, thank you very much for your advice. I'll try Sodium Hydroxide next time. Yes, in my case it was a strong lacquer thinner but surprisingly the plastic took no harm at all. Thanks Red Caboose guys! So you use the solution over and over? Wow. I'll do that with the next tank car.
Meanwhile I was able to decal the painted car again, this time there is no reflection on the tank, just the underframe remained a bit dull and you can see that with some reflection as a result. I'm satisfied.
Now I'll start to do some weathering with oils. It's a very complex topic and I have some HO stuff around to practice. Shouldn't I ever post an update, I ruined the car :-)
