Hello, Mate . . .
I used Simoniz satin black 500ml rattle cans to do chris' Duster (quite successfully me thinks . . .
I think I used 36 in total . . . . The Dart's a shade bigger plus it has an extra set of doors so I'd guess 40.
I worked on the assumption of 3 per wing, 2-3 per door, 3-4 roof etc . . . plus overlap.
The place where we got the paint from got us it in in bulk so it cost well under £100 in all.
Hang on . . . .