Mark and everyone, 

        This is a very helpful thread.  The comments will save me some big problems down the road.  I want to do this myself but remember I'm blind.  That means I'll be touching everything and getting my hands on everything.  Roofing material would be a bad thing for me to use for that reason.  Spray foam and spray undercoating are out for the same reason.  The Dynamat sounds like it has worked for people and no one mentioned a mess factor.  The cost was a concern but for me messing up my van interior would be something I need to avoid.  I also remember putting in fiberglass in some areas but later I was concerned that it retained moisture and blocked drains I didn't even realize were there.  

        Can someone who used Dynamat speak to how clean or not so clean it is to apply?  This is sounding like the best way for me to go so far.

Eric Caron 
85 Westfalia GL Auto with currently a non roof cement black spotted interior!

 
On Jul 18, 2013, at 10:32 AM, Marc Perdue <mcperdue@GMAIL.COM> wrote:

> I put Dynamat in my passenger door before I knew anything about the "art"
> of sound deadening. I covered the entire inside of the door as much as I
> could. The results were pretty amazing in that the door sounded more like a
> Mercedes door than a metal garbage can when you closed it. I have since
> found that you really only need to cover about 25% of the metal to get the
> same benefits.
> 
> If I were to do it now, I would focus on certain areas:
> 1) Front and sliding door;
> 2) If you can get to it, the metal behind the dash. You get a LOT of noise
> from the road and rain on that big sheet of metal.
> 3) The roof over the front of the van.