midlifecrisis
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The 4200 and GS suffered from poor internal corrosion treatment and generally rusted inside out, particularly around the right hand side where the wishbones connected.My view is that it is more related to use and storage. If you are buying a car, get it thoroughly inspected and then protected if all is well and you shouldn’t have any issues.
The GTs have surface rust generally meaning that it could be use as Zep says.
Treatment is simple, remove surface rust, treat the surface with a quality rust inhibitor and then paint with a quality protective coating.