Adhesive for exposed gypsum?

[David Iddon]

Anyone have any ideas what adhesive (preferably gun applied) sticks to exposed gypsum (unpapered plasterboard)?
I'm wanting to fix aluminium channel to routed plasterboard. I'm thinking CT1 but would I need to use a primer on the gypsum first - maybe one of the Zinsser primers like BIN or Peel Stop.
Screws aren't really an option. The channel is 12mm (w) x 8mm (d) and very light weight.

 

[PawelM]

I would seal exposed edges with some sort of pva and stick it with any type of adhesive (polymer type is my preferred option)

 

[David Iddon]

I would seal exposed edges with some sort of pva and stick it with any type of adhesive (polymer type is my preferred option)

Thanks - so something like a basic undercoat? Watered down or not?

 

[PawelM]

If you have some zinsser bin you can use that. Any water based undercoat or paint best to water down a bit so it soaks better and second coat full strength. It's just to stop dusting so adhesive have something to grab onto

 

[David Iddon]

If you have some zinsser bin you can use that. Any water based undercoat or paint best to water down a bit so it soaks better and second coat full strength. It's just to stop dusting so adhesive have something to grab onto

Thanks for your advice.
I did some experimenting with stuff I had at home (pva paint, mdf primer, tile adhesive, pva glue, cheap grab adhesive) and unfortunately none of these options held sufficiently. The tile adhesive and PVA glue initially looked to have come up trumps, but a little wiggling and the channel popped off! I then bought some Gorilla glue and CT1 and both are holding firm!