i just used these 3 things to make my trunk more "stable" the gorilla glue was used on a cracked quarter panel from the bass lol. also along the other side where a crack might happen. used gorilla tape to seal a few holes that air was escaping from. then the spray foam "great stuff" large gaps and cracks to fill the extra voids on the side of the box to stop the flapping. should make the whole thing more sturdy and hold up better. and FYI: gorill glue is nothing to fuge with i still have some one ot on my thumb form 3 days ago i had to use a wire brush to get it off my palms. it goes on like syrup an expands like foam.