Greetings . . .
Perhaps the modern rat rodders are using just the basecoat from any of the basecoat/clearcoat systems? The result would be dull but durable - way more durable then primer only . . .
I read an article awhile ago on streetrodderweb that quipped to this effect:
Body Prep & Paint search the .pdf for "Sorry Rat Rodders" for this photo caption 'tip'?
regards,
Keith