Gibbs Product will protect the surface the best for fabrication. The acid will protect from rust but will make it a pain in the ass to weld on.
The reason not to put the entire car in epoxy primer is that is your grinding off the primer to do metal work your breaking the seal. We have gotten to the point we don't blast the cars any more as it's just to rough on the metal and the rust faster after being blasted. We paint strip the panels and just blast the parts that paint stripper would work on.
Plus if the epoxy primer sits to long it will absorb moisture and start rusting in less then a year. There is no way to prevent steel from rusting unless you properly seal the metal and paint it a timely manner. Most painters will sand off any epoxy primer if it has been on there for any extended length of time so it then becomes wasted effort.
So get all your metal work done, Then proper prep the entire body for primer right before you start body work.
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