Sorry guys, I am going a different direction with my suggestions.
People do "sand blast" car bodies without destroying them. People also perform open heart surgery without killing the patient. But I know of no one who is capable of pulling off the heart surgery and I am not going to take the chance myself.
Sand blasting car bodies is VERY difficult. I am not talking about what
I can do, can
I sand blast sheet metal without warping? Yes
I have done it, not very big pieces though. Could
I do a hood or door, maybe. Oh yeah, we aren't talking about
ME, we are talking about
YOU. Being I don't know
YOU and
YOUR skills and understanding I am going to warn you
NOT to sand blast your sheetmetal.
One huge misconception (even among those who "know" what they are doing) is that the warpage is caused by "heat". Sorry, couldn't be further from the truth. In fact, sand blast paint off a piece of metal and then quickly feel the metal, it is COOLER than the surrounding metal. You have been blowing cold air on it, so of course it is COOLER. The metal warps due to the pieces of sand acting like little hammers pushed the surface of the metal around "enlarging" the surface while the underlying metal stays the same, thus making the metal "warp". If you want to study this read up on "shot peening" connecting rods, the same thing occurs there.
If you do some searches for threads such as "how do I fix warped panels?" or "Sandblasting warped my door" or something you will find TONS of them. I have seen threads on forums since the first day I got my computer over a decade ago. People who RUINED their cars, their precious classic, RUINED. Some of the stories have made me sick. I remember one was a very early Bronco that was mint with no filler, no rust, a super nice car and it was DESTROYED by sand blasting.
The damage sand blasting causes isn't that "Darn I screwed up and now I have to fix this" sort of damage. It is more like
"$%#@, I RUINED MY DOOR AND HAVE TO THROW IT OUT" sort of damage.
I don't recommend it, there are many other ways to get that paint off. Before you jump into this think about it A LOT.
Brian