yeah, the general concensus is not to use Edead on trunk lids or any place where gravity can cause it to fall off. I would get another dampener like second skin for the lid.
I used Edead of all my doors, and entire trunk, however i have like a carpeted liner on my trunk lid so I will have to take that off from time to time to see if it has fallen. Hasn't fell yet but as soon as it does, I'll probably just go with second skin