Chassis stiffening Foam, anyone used it?

http://www.itwfoamseal.com/automotive.htm

Anyone had any experience with this sort of stuff?

Heres the blurb:

ITW Foamseal's AUTOSEAL Automotive Sealant Foam

ITW Foamseal's AUTOSEAL is a two component foam kit that has been specially formulated for automotive aftermarket applications such as chassis stiffness improvement, sound damping, and reduction of vibration and infiltration of air, water and dust.

Featured in the June 2000 issue of Sport Compact Car Magazine in the article entitled Nissan 300ZXTT, Part V, More Suspension Tweaks and Tales of the Magic Foam (pages 236-242), AUTOSEAL (HandiFoam 11-22) significantly improved the chassis stiffness of the Nissan 300ZXTT. Five (5) kits were used to stiffen the chassis. Each kit yields approximately one (1) cubic foot.

I belive a few guys in the states have used this in there Z's.

The UK link http://www.foamseal.co.uk doesnt list this product(will try calling them).

But this product looks quite good if it will reduce road noise and stiffen the chassis along with it. As I think Dynamat would be more difficult to apply in certain areas.

Trev (Awaiting Timmy's recount of his stiffening foam)