Karljay - I used the fiberglass mat on the bottoms of our doors and although it gave it the strength, what a mess. The bodywork involved to make it look good was worse than grinding it off and welding patch panels in. The fibers show way too much for exterior repairs.

We used it on the floor boards and couldn't be happier. Definately added much needed strength. Main difference is we are planning on covering the floor with carpet so the fibers showing through once repair is complete doesn't matter. I imagine it would work just as well used on the interior of the cab corners since the exterior would need to be bondo'd anyway.

Like you, we saw the demo, and it made too much sense on how it works. It actually does work, but I don't recommend it in places you plan on having visable.

Carlene