If you are lucky, your project car is straight with no big holes rusted in in behind the wheels in the fenders and quarter panels. But even if there is no rust through there, you may find that rock nicks and chips have allowed salt and moisture to eat little pits in the metal.
DIY HOW TO Repair Rusty Bodywork - Any vehicle without spending a fortune
Rust pitting on body panels - Technical - Antique Automobile Club of America - Discussion Forums
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Rust pits solved with simple trick on the Chevelle
Rust pits solved with simple trick on the Chevelle
How To Repair Body Rust