Talk about overkill and wasted $$, IMO.
For a little rust, I'd just blast the area and move on.
Soda or media blasting works great for stripping paint.
You don't need the metal to look perfect and virgin to paint it, you just need to prep it properly. Just like any normal high $$ paint job.
So there's a little surface rust hidden inside some area (say rear frame rails). Where's it going? It's not like the car is going to see salt and moisture to help activate the rust. Look at the underside of the dash and see how (surface) rusty that is and it isn't like it's falling apart.....
Now, if it was a rusty hull that had bulging seams, then I'd dip.
Roger Gibson restored many a $$ car, he's only dipped one last I knew. A L89 raptop, say I think it's still around.
