I just removed the stainless steel roof rail pieces from 67 Malibu and I am about to re-intsll them, however, the book (Fisher Body Manual) says to use a "pumpable" caulk to attach roof rails to roof. They are also attached by some 12 screws. My problem is, is what is a "pumpable" caulk? What came off was something like a foam tape with what appears to be some soft grey compound. It came off easy enough, and if I were to replace weatherstripping sometime in the future, I would certainly like it to come off easy again. Any ideas out there?