i used 72 sq ft just on trunk,doors,interior except roof ,would need at least 20 more sq ft. id sayto finish. about 108 sq ft to do whole car (68 camaro) its like 80 lbs worth so far but it works.i used the dynamat extreme
I just used two bulk packs (72 sq.ft) and that covered the floorpan and inner and outer door skins. I doubled up on the tunnel and firrewall and I still have a couple sheets left over.
worth every penny. I could not believe the difference it made. No interior rattles and the doors sound solid. I wish I would have added the stuff years ago. I went with Dynomat Extreme. Check ebay for the best prices.