Stuart,
If the glued panels failed it was probably due to one of two different
things.
(1) improperly prepared mating surfaces
(2) wrong, or cheap adhesive.
Ford Iknow for a fact has been using a Body panel adhesive on their
doors and quarter panels for at least 10 years.
I have used 3-M body panel adhesive on the front cowel panels of Mack
trucks for at least that long, with no failures, ever.
It all depends on who's doing the work, and how and what's applied.

Later,

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Terry 85 GL