These are all great suggestions and I am not arguing with anyone or against them,
The term "best" was asked.
In my opinion the best is what Ford did to the production line Mustangs from 1965 on.
1)The exterior rocker panels were heavily galvanized 2)The boxed chassis was vat dipped in electrostatic enamel primer.
In many cases after more then 40 years, it is still in place.
Where corrosion has occured is in places on the car that were never treated to this process.
On the Mustangs there is nothing but this primer as the final finish under the car.
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