I was looking at Peel N Seal and noticed that the possibility of a smell was really the only downside. And seeing as it's got that shiny metallic covering all over it except on the edges, wouldn't simply sealing the edges contain any possible smell? I'm not sure why no one on the sites I've looked over mentioned it as it seems like it would work perfectly fine...
And for clarification, I'm looking for deadening the rattle in my trunk, not dampening the music (which I may have said by accident). I actually found these (as weird as they look): http://www.lowes.com/pd_310823-82801-A50-50_0__?productId=3080009&Ntt=peel&pl=1¤tURL= %2Fpl__0__s%3FNtt%3Dpeel
Since the goal of deadening is to add mass to the resonating piece of metal or whatever is vibrating, could these work if I found a good way to keep them stuck to the top of my trunk? It seems like it'd be the same thing as getting the CLD tiles (no butyl, but it's the weight that counts), just possibly much cheaper and maybe a bit harder to adhere.