I put some of the Home Depot product (the "U Seal" stuff) in my doors, meaning stuck to the outer door skin on the interior door area. Also on the floor, under the seat, the flat foot area and up the slope some. Covered it with the rubber floor mat, then carpet over that.
This was last spring I did it so I have had one summer on it and I never picked up a wiff of asphalt smell. But I really appreciated the quieter ride, it all made a big difference.
