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Tesla Cybertruck May Have A Rust Problem
(www.carsdirect.com)
This is a most excellent place for technology news and articles.
Urethane? You mean paint?
https://www.eastwood.com/paints/automotive-finishes/colors/single-stage-urethane.html
Its like these amateurs are figuring out why we paint cars... its because Urethane protects the metals from rust. I guess they could use Urethane film instead, but that's probably just not as good or efficient as paint...