I used a can of the 3M on my driver's side door, no smell, looked great and dried quick in the sun. But I plan on trying some Kwik foam for more of a filler. I don't see how the 3M would do much in the doors for niose. It did only say it adds sound deadening. So I'm hoping the Kwik Foam will be noticeable with all doors filled. I've been looking at actuall sound deadening sheeting also, I'll put that on the roof and floor along with my new speakers. Is there an easier way to get to the rear speakers besides taking the panel out? I didn't see any other way. Thanks.