Well I sound deadened my whole car. I used 6 gallons of Second Skin Sludge, around 80sqft of SS Damplifer, 20sqft of Dynamat Extream (got some freebies from my bud), 35-40sqft of SS Rattle Pad, and 3 sheets of SS Over Kill (dunno how much sqft, but I would say around 120-150sqft). You should need around 5-8 gallons of liquid deadener depending on how thick you want to put it on and where you want to put it, 40-100sqft of mats also depending where you want to put it, and 20-40sqft of Rattle Pad to help cousin the plastic agenst the metal if you want. I used the Damplifer for the doors, I don't like using liquid for doors. Then I put a layer of Overkill in the inside of the doors, and some Rattle Pad over that. I did all the plastic with Damplifer/Dynamat Extream, and then put Rattle Pad on it. After that I used the rest of the Overkill for the floor. Here are the pics
http://www.picturetrail.com/gallery/view?p=999&gid=7064955&uid=1612587