yea i was tring to stop the flexing of my side panels in my astro - down along the rockers - 164+ db everything shakes, damn i had to use a dozen tubs of liquid nails to hold the roof supports together and fix a sheet of 3/4 mdf to the ceiling.
i got lucky it just expanded up and out the top, and i cut it off
but i saw another installer use it to make a speaker incloser in the door (he hollowed it out to size he wanted after cured) but the door bulged out and had to be punded back in.. funny to see a installer do body work......