<<Flashing tape is generally a 2"-3" roll of 20mil plastic backed
bituminous adhesive. Peel & Seal is a 45mil foil backed roofing material
available in 6", 12", 18" and 36" rolls. The original Dynamat stuff was
(if I recall correctly) the same foil backed adhesive stuff, but only
40mil.>>

Well here is the last and final question then , and I'm only asking this
after looking at Dan Reeds web page.

I have used Dynamat, and Q-Pads inside the door's and side panels in my
Vans.

Works well.

After installing the Q-Pads in the door's I replaced the stock vapor
barrier's.
The viscuine sheeting.

OK.
The pictures of Dan's L/H door shows that he used this metallic looking
tape on the outside surface of the inside of the door panel, which he
says is the roof flashing material in leu of the stock plastic vapor
barrier .

How in the heck did he get the interior trim panels back on the doors if
the material he used is as ( almost ) as the dynamat or Q-Pads?

It seems to me that this would be almost impossible, or at least at best
have the interior panels do some bulging.

You see what I'm saying?

Something isn't right with the claimed thickness of this stuff.

But it sure sounds good to me if it works.

Is the adhesive backing as tough and sticky as the expensive sound
deadener?