Originally Posted by manticus
Their plastic car panels were as heavy as the metal panels, afaik, which was a big reason for not developing them further.
Our '02 Avalanche has the plastic cladding and weighs around 4400 lbs. For vehicles like this, a small increase in weight is a good trade-off for corrosion resistance. My first chevy rusted out from under me sadly, and with the increasing use of more corrosive road salts, I pity people in the NE. I thought the reason for dropping plastic was because people didn't like the way it looked.
Our Avalanche also has single-side galvanized sheetmetal, which you can't do to magnesium (I don't think) or aluminum. I just noticed rust starting to form on the car after >10 years of rarely washing it. If you can anodize magnesium like you can aluminum, I guess that would be something. Paint is BS. Piant gets chipped too easily and then rust happens rapidly. Not the way to go.