Yes literally.
I mix dry cement mix (no aggrigate) with a roofing product called Sta-Kool (or Kool-Seal, etc.. has different names in different places in the country). It makes a sticky concrete that seems to have some flex to it. Used it on my 97 cavalier doors and outer quarterpanel skins, works great. Tapping on the outside of the body felt like it was armor plated (seriously), the door felt solid like cadillac doors (not cavalier doors haha) and the stuff even stayed on after my buddy bought the car from me and got T-boned (2 weeks after he bought it from me lol). He said when he pulled the door to replace it (he's a mechanic/body man) the door was crushed in but the concrete was still stuck to it. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
I just applied the stuff to the inside of my inner tailgate panel last night, as the subs will be firing directly into it. The tailgate feels like its made of 1/2" thick steel now.
If I hadn't dropped and completely broken my digital camera 2 days ago trying to document my sound deadening project, Id post some pics for you.
