The nice part about the xtreme is that it has an aluminum plate on it... which makes it REALLY nice to install because you arent swimming in tar... after I put down a layer I heat it up with a heatgun and I roll it out with a roller untill I can see the old formations in the sheet metal underneath (ridges, holes whatever) So far it has worked for me... when I get it done I am going to use rubberized undercoating in the areas I cant reach then put a layer of dynaliner foam over the entire thing... (except under the headliner)
patience is the key
when it doesnt want to work with you, dont work with it.
I figure it has taken me 48sq ft for the trunk and about the same for the passenger side of the car including doors over to about 3 inches from the top of the driveshaft hump. I imagine its going to take me 8 boxes of dynamat to do the interior... (12sq ft each)
Take your time, work only when it works, if it starts to be a little biatch then back up off it for a while, nothing ruins a day like getting pissed and screwing it up worse (sound like the voice of experiance?)
The downside to xtreme is the same Al. plate... I had 3 cuts on each of my first three fingers on my right hand after the first 2 hours I used it... in short WEAR GLOVES!! get some of those .5 mechanix gloves, the .5s protect you but dont have the lack of touch that wearing the reagular ones gives you