It's called "aircraft stripper". :-) Available at most respectable automotive paint stores.
It is a gel-like material containing some very aggressive solvents. The gel keeps in in place while the chemicals do their magic. The paint wrinkles and turns loose of the substrate underneath, then you wash it off with water. You may need to use a wide-blade putty knife/scraper to give it a little help, but it shouldn't need much if you put it on right. It comes in 1-gallon cans with a corner cap, similar to what
paint thinner and such come in.
It is compatible with steel, aluminum, and other metals, and is commonly used in the aircraft industry. That's why it's called aircraft stripper, but even in the automotive and other trades, they still use the same term. It is sold "for use by the professional trade only", so don't expect to act like a stupid consumer, screw up, then become independently wealthy by winning a mega-lawsuit. The residue is water soluble, so it should wash clean with a good car-washing or quality liquid household detergent (some liquid dishwashing detergents are rather ineffective despite lots of advertising and high sales).
Please give more information about this product - aircraft striper. What is it called?