Rust is a great insulator and so is chrome. Maybe try cad plating? I don't know what kind of thermal properties it has. Joel in Keller, TX (DFW area) '66 Corsa w/air '63 Greenbrier 4spd '63 Greenbrier 8dr 4spd "Bob" '63 900 Convertible 4spd '67 Monza 4spd Posi '62 Monza Wagon PG 15 others