Most of these trucks have survived for decades with fairly basic protection so regardless of what you use they'll probably outlast most of us here.
I personally used POR-15 with fairly good results.(If I say so myself) wink
Chassis with POR-15 paint


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.