not sure,i know the tipo had galavanised body panels,one good thing with new cars they don't rot, not like ten years ago and older all cars seemed to rot.my mate runs a motor factors years ago he used to sell tons of body filler now next to none.
I was told the Cinqs had fully galvanised bodies but boy they rot! Likewise, the Tipos rust underneath as good as any older Fiat did. It doesnt stop rust, just slows it down.