I do not think it is actually acid just chemicals that will remove all the sealer, rust and paint. I purchased a car that had been dipped. There are horror stories about cars that were dipped and never stopped rusting and have issues.
This car was done several years ago by Chem Strip I think is the company in Statesville, N.C. They have branches at other locations but I am told that that division has the proper tanks to dip and neutralize the chemicals after stripping.
I see no signs of any bleeding from the seams or weld joints. Once this car was stripped it was sprayed with epoxy primer. When I first got it I had to store outside for about 6 months with just a tarp on it and still no signs of any bleeding. I will be putting it on rotisserie this winter to start the rebuild.
I am not aware of anyone with the ability to dip prime or ecoat a body. There might be. One thing to remember when doing ecoat the tank has mostly water in it withe the paint suspended in it. The ecoat does not get inside like the hood or trunk reinforcement. It will still be bare metal. The process uses and electrical current to attract the paint to the metal but since the solution cannot flow freely inside the panels there will be no coating. You have to use something like Ziebart and drill holes or go through holes in the panel and coat inside. I think Eastwood makes some wands that you can to inside panels and coat with. I have seen Dynacorn NASA hoods that one of the forum members cut the center out to raise and modify and it was bare metal inside. That is why you should never wash our cars with a hose or pressure washer. You only feed the rust on the bare metal.
I just got my DIY big dip tank going. I got one of the 275 gallon bulk chemical tanks and got 20 gallons of molasses and mixed with 9 parts water so I have 200 gallons of de rust mixture and cost $50.00 for the tank and $90.00 for the feed grade molasses. I have a fender and trunk lid in it now and after about two weeks will take out and pressure wash and check it out. I have a second tank that I will be putting water and baking soda in to kill any of the acid from the molasses.
Since this is a first time for me doing panels with inner and outer skins I will be doing some experimenting.
I will put phosphate solution in the inner and outer and then POR to try and seal things up. Then epoxy primer.
The molasses does not take sealer or paint off unless there is rust under it. Have had great results in the past but have not done the assembled panels before.
Here are some pictures of my tank and the before pictures of the parts I put in. Just parts that were in the barn off 65 mustang to give it a try. I need a swimming pool so I can get the entire part in. That is a concern doing 1/2 of the part at a time. I could not find anything bigger at this time.
I am waiting for a bear to come and go swimming now, lol.
The parts have been in one week now.