Butyl is very outdated. It smells and takes forever to cure.
If I were going to bond a side window back into the track I think I'd use something like 3M Window Weld or their Auto Glass Urethane adhesive that comes in a caulk gun tube (around 10oz.)
And id probably do it in place to be
absolutely sure that it lines up and closes all the way.
Other manufacturers/distributors sell about the same thing, so you might also have luck with C R Laurence or Henkel brands.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.