I could have added some, yes, but every plane, at one point in time, wasn't covered in exhaust smoke residue. Perhaps you could pretend that it's a brand new Bf109 that's just been flown from the factory to your airfield. I painted it, now it's up to you to get it dirty and maybe add the ingame weathering if you have to, it's kinda hit and miss for me when I try to use it, so I'm not really sure how well it works. Attack a couple of bombers and see just how new your machine looks then.
Truth be told, I stopped skinning for CloD before I could get a nice weathering layer done. ...Or so I thought I had stopped.
