Duct work

I have ooodles of common sense but can someone tell me a good way to fix this?The duct has separated so before i install the dash I WANT TO FIX IT

Not sure what I'm looking at in the pic. Is that a flat type duct with a curve/bend in it?
Only suggestion I would have is wrapping some fiberglass cloth around it, and a couple coats of resin on the glass. I use West System epoxy, but the polyester resin would work. The surface would have to be roughed up to get the glass to adhere to the plastic duct, and even then it doesn't stick very good, so I recommend wrapping it all the way around the duct to make sure it stays there.
That's my story, and I'm stickin' to it Hope it helps.......

Why not just use the aluminumized duct tape for furnace pipes? I am NOT talking about regular cloth duct tape that everybody uses for everything that is silver in color. JB

What JB is talking about is this stuff:

Yeah, I forgot about that tape, and it would be a lot easier than fooling with glass & resin. I always have the the glass etc around here, so my response was how I would usually do it.

Well i took my wood clamps and propane torch.This thing will blow dry your hair when installed,guaranteed

So you "welded" it back together? Sounds good if ya did!! I suppose you could re-shape it with some heat on it etc.

when i removed my dash the ducts were separated in several places, but it looked like they came this way from the factory, they were just clamped together on a couple of places without any sealant. i sealed it with regular silicone sealant and i think it works just fine.

i also found a pen jammed in the hatch that directs air to your feet, body or head.