I feel for you guys working in the rust challenged parts of the country. I am using Zero Rust liberally underneath the truck but it is a real treat to start with a truck with zero rust.

You would be amazed how good a 50 year old truck can look if kept in a nice warm and dry climate.
I am thinking of spraying the outside of my 62 dumptruck with the Zero Rust. The 54 will get real paint.