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Message: <blockquote data-quote="ichiwan2" data-source="post: 38072" data-attributes="member: 153">Originally posted by keray@Dec 16 2004, 12:52 AM How significant is the improvement for the NVH and stiffening ? Anyone tried it before ? I thought I read in the AW forum a while back that there might be some problems when the foam ages. What exactly that problem is I don't remember but I believe that it may just be a theory by one of the forumers.  Tyre roar is muted (not totally eliminated), car handles bumps better as less body flex.  Simple experiment, knock the sill of your car from the outside.  You should hear some hollow sound.  Imagine if the cavity was filled up with something solid.The foam expands in the chassis as it cures.  So virtually all pockets of air should be expelled.  Thus, oxidation of the polyurethane foam is minimised.  Due to the expansion and the stickiness of the material, it bonds with the metal inside the chassis.Tried burning it with petrol, poured acid on it to no effect.Worst thing u can do is get it on your clothes or skin.  Very difficult to remove.</blockquote>