Strange. I weighed all the sound deadening tar from my 92 B13 and was up around 50lbs total, that includes all of it, front, rear, and trunk. The front came out in large chunks, some parts in the rear (and especially trunk) were a major pain.
Here's two pics of the trunk w/ removed tar, after I sanded, primered, and painted (had nothing better to do with it this winter - no it doesn't match really (I'm mostly colorblind) but the carpet is on it most of the time anyway w/ the spare)
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![](http://img.photobucket.com/albums/v87/Storm88000/Storm88000181/a1c638bc-545d-4706-a5e0-3f3975113525_zps84667c28.jpg)
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Sorry for flip-phone cell phone pics lol