I'm in Idaho Things don't rust here. I have an old junk valance that I tested out my sand blaster on when I first got it 6 or 8 weeks ago. I blasted half of the valance and left it outside uncovered. It has rained 3 or 4 times since then and it's not even starting to change color yet so I don't think it will rust before I get done. I understand what you're saying about having a pro do it. I did have a pro do the important parts. But under the battery tray will never be seen and the area under the trunk behind the bumper well if anybody ever sees that I don't think they will live to tell the story because the tires would have got him first.

I'm in Florida, so the humidity gets to metal fast.

Also, 80 grit on a DA works well on surface rust. Time consuming, but it doesn't heat up enough to wharp anything. Bad pitting would have to be spot blasted, then etched and filled. I use short hair fiberglass, as it is permanent, but goes on like plastic. If you etch it afterwords, it will hold up fine under epoxy primer. I did a hood this way 3 years ago, it still looks like I just did it. Maine sucks humidity wise, it is like Florida, only COLD all the time. But as long as you get rid of the rust it won't come back to haunt you.

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Why does it matter if the panels have a little warping in them?

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Now this is a REALLY stupid question or statement! The simplest answer is LESS WORK to fix them!!