Brazilian Dodge Dart 76 (similar to 69 usa)

Hmm,that's something many folks don't think of. Painting inside will slow the rust down . I've used rust converter lots. It won't stop it,nothing really does short of grinding or cutting it out. But that will slow it up for a few years

If "a few years" equals to "30 years" I'll be really happy :cheers::cheers::cheers::cheers:

I'll also apply sound insulator inside doors. The insulator I'm using is a kind of asphalt. It melts and also insulate metal from humidity.