Just put a stereo system into my XJ and would like to do a little soundproofing. Right now I am running without carpet so that is where the majority of my noise is coming in.

I bought some rattle trap sound deadening material on ebay which is supposed to be pretty good but want to make sure I apply properly. I repaired my one floor pan rust area and rest is clean (want to keep that way). Should I herculiner and then rattle trap on top of that or rattle trap and then herculiner on top of it? I am trying to avoid trapping moisture and creating a rust issue. Any other suggestions welcome. Ok to double up the rattle trap? I have 75 SF which seems like a lot of extra if only doing the floor...

 

I put all my sound mat on the high points on the floor to help it from pooling and seeping underneath it

 

Put some on the inside of the doors too

 

I'm planning on putting dynamat on the door panels, rear panels and firewall. It's a sound dampening flexible material about 3/8" thick. Waiting for my stereo components to come so I only have to remove my door panels once.