I use this stuff called Foilastic. Its made by Polyken and sold at
roofing supply houses. It has foil on one side and a butyl/asphalt
1/16" sticky (very sticky) base on the other. It cost $40 for a 50
foot roll that is 9" tall. I like the 9 inch tall roll because
anything larger than is hard to get into small cavities like the
doors, etc. I've done my entire van in the stuff and it makes a huge
difference. Foilastic and other products like it are not really
"soundproofing" ---they are more like  "sound deadening" in that they
will stop vibration from traveling down the vast expanse of sheet
metal that make up a Vanagon body. If you do just the doors, be sure
to do both the inside skin (right behind the doorpanel) and the door
skin itself. Your doors will now "clunk" instead of "bang"! Its a
beautiful thing.

Jeff

87 Syncro Westy
On Mar 14, 2006, at 8:01 AM, Automatic digest processor wrote:

> ------------------------------
>
> Date:    Tue, 14 Mar 2006 09:30:39 -0500
> From:    Dustin Jones <jonesboy21@GMAIL.COM>
> Subject: Soundproofing material
>
> What is a good material to use to further sound proof the engine
> bay (and
> possibly the doors) in my 90 Vanagon Carat?