I agree with 56 stepside on the Aircraft stripper, however I get mine at Carquest for a little less than that on Ebay. It does work best on warm days. I remember doing a project and watching the 3 coats of paint including the original factory paint nearly sliding off the rear quarter and onto the floor in a short time. I also learned that if you dont wash it shortly after removing the paint it will flash rust. I generally washed the bare metal with soap and water, hosed the car down with a spray of a conversion coating, dry with compressed air, and then coat with a non sanding zinc chromate epoxy primer.
I have also had parts sand blasted (dont recommend), media blasted (recommend), acid dipped (recommend), and I have used the 3M paint removal discs (recommend for small areas only)
That is my 3 cents worth.
Scott