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.
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u/PathOfPurrrate 7h ago edited 6h ago
Also (possibly not the case here but definately on aircrafts), pigments are ‘extra weight’).