[Mr70]

When Dean owned the Benchmark Chevelle,he told me about an industrial chemical stripper he used to remove the reminants of the old hard undercoating that then revealed the beautiful original belly.
He said he had to drape plastisheen all around the car,for protection and on the floor to to capture it,and wear protection as well,but once finished,he rolled it all up with all the old undercoating for the garbage.I saw the finished result and thought it was outstanding.I can't recall what the name of the product was,but SS427 might know.