Because this is the exact same stuff they use for casts. It is fiberglass cloth gauze impregnated with water activated resin. I have been looking for a source for this stuff ever since I saw how amazing it was when I had my arm cast several years back.
They first wrapped my arm with about a 1/4 inch of cotton gauze and then wet and wrapped this stuff pretty much just like the gauze. Indestructible after it is hardened. What a fantastic bugout item to have in your inventory.
The reason they warn about direct contact with skin is because it gets hot while the chemicals react during set up, hence the layer of cotton gauze. Actually I wouldn't mind just getting some of the resin it's self. Brush it on and spray it with water, Done!
I found they have it pretty well guarded.
If I disappear from a discussion please forgive me. My 24-7 business requires me to split mid-sentence to serve them. I am not ducking out, I will be back later to catch up.
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