Ah, got it. I have tried very hard to forget about 70s/80s Fiats. :-)
When is the last time you had a car undercoated?
I take your point, but the real answer is “when I lived the U. S. Midwest”, where they salt the roads. Since we moved to the milder climate of Washington state, even our ‘81 VW’s body is in great shape. But, yeah, in the 80s: straight from the dealer to the undercoat place.