Our Nissan has developed a rattle every time the boot is shut.

On investigating it turns out that the rear window is coming loose. Top left corner has come unbonded from the surround and is rattling about....so just wondered what I should use to refix it in place?

I assume a mastic type substance, but is there anything better/more suitable for the job. I guess autoglass type people must use a specific type of bonding substance?

All help gratefully received.

Many thanks

Mark