the factory used tape to apply trim on my 87. Most of the trim is still on there. All of it would be on if it hadn't been caught on tree limbs and such. the only thing is that it creates a place for water to sit and rust the metal. on the places where the trim has come off on my truck, you can still see the adhesive and pitting where the water sat. but the same could be said about the holes and clips. my metal cab trim below the back window on my 69 caused areas to rust, so it's a toss up. the tape should hold excellently though. Trim is just an accent, so who cares how it's applied? It's not like you're trying to use bondo to make a fender.
