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IMO it sounds like you're better off just scraping off what's loose/flaking off, treating the rust with whatever rust product you were planning on doing, then re-doing the entire undercoating, applying fresh stuff over top of the original undercoating that was still in good shape.

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Well .. I've done a couple cars and,, There is no easy method

I suppose the 64 took me 150 total hours to make perfectly clean.

Anything you use , be careful to not[/quote



150 hrs?

There's a faster way, no fire, no burns and you don't breath any dust. A very hot steam cleaner...
I can do the bottem in about 3 1/2 hours.No scrape marks or gouges anywhere. I used a steam pressure washer. I did it in one afternoon and was done with it.



It's still wet in these pictures, those are water droplets hanging off the car.





Big Mike, Here's a tip for ya. That aluminun tank in the picture below, has reg 87 oct gasoline in it. It's a pressurized tank with spray wand. (I used it for years at the track to clean parts) I spray the heavy off first with the presure washer and then spray it with gasoline. It softens the road tar and under coating and speeds things up. I'll spray it wait two minutes or so and then blast it off.
I've been cleaning heavy duty trucks for years with these type of pressure washers. Go rent one from a pressure washer place or a tool rental.
I used about two gallons of gas doing the job. You would think the run off would kill the grass but it does'nt. I think most of it evaporates before getting to the grass, it's very hot and steamy to the point where you can't really see to good, so most everything evaporates quickly.
If diesel fuel or kerosene were used it would be a nasty oilly mess when done and would get to the grass. My

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Like everybody else,I used a propane torch,scraper,hammer & chisel,wire wheel brush,etc.Lots of elbow grease.
Very time consuming.But worth every minute of it.

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Paint stripper works good, and is a lot less work too. (Use it outside!) Hit it with an old wire brush as it is working, a few times. Then use a putty kife.

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This is the way to do it then just wipe it down with laquer thinner....Removed quite a bit this way and it goes pretty quick...In your case make sure you wear protective clothing and eye wear cause that stuff does burn...