Ok so I recently picked up 20sq feet of reg Damplifier from Wheel Class(only place in Ontario) to get rid of the aweful rattles in the trunk of my car.
Here are some pics
Let me tell this stuff works awesome, my lid now rattles very minimally, I have a before and after video of tapping certain spots.
I would have included a before and after for when the bass hit, but I blew my subs half way through the install so... enjoy
Let me tell you, being 6'1" and 220lbs, it was so hard maneuvering in there haha