Removing heavy undercoating from inside 1932 Ford 5W Coupe body/doors

Rebuilding a coupe that has had very heavy undercoating applied 100% inside the body and doors.  Dippers won't dip as the undercoating will mud their tanks.  I'm nervous re: sandblasting for fear of too much pressure and consequent heat and metal warping.  Eastwood markets a package that supposedly softens the undercoating, but recommends using a torch as well - same fear of warping.  Any suggestions from experienced persons?

Thanks,

Jerry  

I used a heat gun made by Wagner on my car. The max. temperature out of the gun is about 600 degrees, and won't deform your metal. The undercoating softens up so you can use a scraper to peel it off. I found that mineral spirits will dissolve the undercoating on my rig, but yours may be different. Watch out for flammable solvents. You can ignite everything if you use them. Keep about 6" away from the surface. The stuff really stinks when it gets hot, so ventilate or wear a paint mask with the activated charcoal filters.  

use strip ease you can find it at lowe's in a gallon can. brush it on and let it soak it will eat anything.
But do it outside this stuff burns. Also invest in a good pair of rubber gloves. don't get it on anything you don't want it to remove. it bubbles when it's ready to be removed.  

I read an article in a different magazine where they took out the undercoating from the floor pans etc. They used dry ice and/or broke it up the coating when frozen or pried it off that way. It worked well from the pictures they used.