This stuff is pretty light, I mean it does a he'll of a good job for what i use it for...i used to get major body lift on high speed runs in my slash...practically would rip the mount holes, causing my truck to do the wheelie at full speed, directly onto it's top, it's quite funny watching it...
I line my 4×4 slash bodies, when they start to rub through, or crack apart from lid landings...nuclear tape to stiffen or patch, 3 light coats of bed liner on top...adds weight yea but I cut airflow paths through the body first, so the added stiffness helps regain the structure...