Correct. And being both certified to and having done SI on thin-film intumescent materials, I am confounded on how the testing would be done. Following AWCI Tech Manual 12-B, the testing apparatus only work with ferrous substrate. I am positive that there are other means and methods for testing on non-ferrous substrates, but I lack familiarity and would suspect that SI was not performed in this application, otherwise a report could be provided to the building inspector and likely assuage his concerns.Click through the links, and you'll see that special inspection is required at installation to confirm proper application.