I'm no expert, but this makes no sense to me.....
Rat Look,
Born of the Hot Rod/Street Rod scene, where limited budgets meant that all you cash went on the motor and running gear, leaving none for fancy paint etc......it has since become an image choice but should really still incorporate a hot motor.
Patina,
The preservation of something original, faded paint on a rock solid bus is something to preserve and show off.
Neither of these work with a 1.1 Corsa, your Grandads old Rover 45 and, to be honest (and perhaps a little controversial) it doesn't belong on the bonnet of a newly painted T4/5 or a Golf either.
I also don't get painting a bus/beetle, whatever, and then going at it with some wet and dry.....but thats just me..!
That is all! :roll: