Stick down sound proofing ,Insulation?

anyone tried the stuff from Eastwood? - it has butyl rubber and sticks like crazy - it would never be easily removable from what I see...but maybe they are all this way?? I got some but am hesitant to use it on the rear floor with heat and possible smell - should I be? would be tough to get out...
Eastwood usually has pretty good stuff for us enthusiasts. Perhaps put a small piece on some scrap metal and warm it up with a heat gun and see if it has an objectionable odor?