The steel aluminum debate is definitely an argument worth having, but I’ll share my experience:
I have owned two difference private coaches. These are actual formerly chartered coaches...not RV’s, not school buses. We all know bad paint chemistry/prep causes paint peel. Several vehicle manufacturers had this issue with their steel bodied vehicles. It’s not just an aluminum panel thing. It’s of course true that aluminum needs special care and handling prep before being painted. When I painted both of my coaches which are entirely covered in aluminum, we had to use alumaprep etching aluminum specific primer before painting. My first coach paint job still looks great 10 years later. So somehow I managed to do a better job than Ford did on their aluminum liftgates. My second coach was painted the same way but the paint job is only a year old so I can’t say how it will hold up long term. I will say this, aluminum does corrode. Instead of rusting away into an orange flake, it just turns into a white powder. This is especially true in places where dissimilar metals are touching each other. For example around the aluminum rivets holding the aluminum coach panels to the steel ribbing there’s galvanic corrosion turning the rivets to powder. My newest coach has an entirely stainless steel frame covered with aluminum body panels with some fiberglass sheet over certain areas so I’ll never see any major rot happen on this one. The first coach I had was a 1984 and even though it had some corrosion, it was very little considering its age and constant bathing in salty roads in Canada it’s entire life. The steel framework was much more corroded than the aluminum so in that case the aluminum held up much much better than the steel did on my old coach.
I can’t say that having either a steel or aluminum body on a car is a bad thing. I can say that if Ford is having paint issues on their aluminum panels, the right thing to do would be research a fix, and repaint or replace the hatches affected. But we all know none of these companies lean towards doing the right thing very often.
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