Whiteout

some planes, for instance the AIA 737 paintkit, can be painted, but they just appear white. Does anyone know why, and how to fix it?
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=15&t=35476
Not sure if I'm reading this right.
I think most paint kits have blank textures. They will have no markings & might well appear white in the sim until you paint them yourself.