I downloaded the C172 paintkit from the forum thread in the 172 forum. As there is no explicit GIMP paintkit, I downloaded the PSD kit, as GIMP can open PSD files. I opened the _t.psd file, to see this: http://prnt.sc/dtwekx
There is no shading by default, and the lines/rivets layers are not visible, despite the necessary layers being visible and in the default order.
I have not specified the cause of this issue specifically, however I think it could be something to do with GIMP opening a PSD file.
If anyone at A2A could maybe make a .xcf (GIMP) paintkit, like with the comanche, I would be very grateful!!!
Also if anyone else has any ideas as to what is causing this, then please tell me