The second car was weathered according to:
Roof:
Folk Art Metallic Silver (662)
Rust:
Drybrushing: Folk Art Light Red Oxide (914), Folk Art Dark Brown (416) 3 parts, Folk Art Licorice (938) 1part, Americana Burnt Sienna
Drybrushing: Folk Art Charcoal Gray (613)
Wash: Folk Art Charcoal Gray (613) 2 parts; Folk Art Licorice (938) 1 part; thinned 5:1 with blue windshield washer fluid
Sealer: Testors Dullcoat