I understand that POR-15 is an encapsulating paint,but would it not make more sense to deal with the pinholes,then overcoat with POR?
As far as painting the outside of the cab,i'm not sure how that would work with your final paint job.
Standard auto paint/lacquer would be air tight any way,so assuming you painted the inside with POR and then the outside with Auto paint,would that not have the same effect?
