Fitting Window Quadrants

[Aeisor]

Hello

I'm trying to fit some 12mm quadrants to our PVC windows with plasterboard surround, but having problems with the top length. How on Earth would I get this to stay in place, without cutting several timber posts to length and supporting? The window is ~2.5m wide.

I've tried contact adhesive - didn't hold. The weight of the quadrant pulled it down. I don't suppose it helps that the length isn't perfectly flat either.

Loathed to try sticking it up with silicone, grip fill, evo-stick, etc... No means of supporting the thing for hours while it goes off.

Thoughts appreciated and thanks in advance.

[ultimatehandyman]

You could use silicone and some sticky pads to hold the trim in position until the silicone cures, like in this method-



Or you could use Everbuilds Maximum torque grab adhesive-