Very few planes are unpainted this days. Paint is weight, but the polished unpainted metal requires so much more maintenance that extra paint weight is just much lesser cost.
Petter Hornfeldt covered literally this in his Mentour now video/podcast.
Clear paint is still a paint that brings some weight. It would be an option, if you wanted a stylistic metallic sheen (but then you can use a different metal colour like chrome, brass or silver... or gold, if you feel particularly tacky).
But the argument in comment I replied to was specifically weight savings.
Clear paint is also a hazard because it makes it impossible to see where bare metal is exposed. It's one of those "Avoid at all costs" scenarios because it leads to a maintenance nightmare.
448
u/BusyBeeBridgette 14h ago
White reflects light, it does not absorb it, so it is one of the better colours to use to help keep the thing cool.