yea it stopped the ratteling. just remember it expandes about 3times what first comes out. dont try to fill it up rite out of the can. fill it about 30%and let it expand. i may not look like you have enough in there but trust me that stuff expands for like 3 hours. if you overfill it it wont dry in the middle and you will cave in. also like timtimtim sayd if you over fill it, it could push out on the sheetmetal of your trunk and make it look wavy. its easy just take off the trim panel and squirt some in all the cracks and between all the skeliton suports. oh and lay a big blanket down to catch any extra that may fall into you trunk or on ur cars paint.