Gflex is made by west systems, its basically like flexible toothpaste epoxy. I don't remember where I bought it.
I use us composites for most of my supplies.
https://www.uscomposites.com/fillers.html
Grab some of their epoxy, the mixing pumps, the cabosil, and either some big syringes or you can make piping bags out of thick freezer bags. If you use the cabosil, make sure you wear respiratory protection, the shit floats like nothing else I have ever seen. Its wild.
Mix the resin first, and add some cabosil a little bit at a time to pet it blend properly and keep it from getting dry lumps, you want it roughly peanut butter consistency. I use like 4oz batches for the resin so it doesn't kick too quickly in the cup.
I don't have my hands on your hood so I can't say for sure but I would try filling the gap between the outer and inner liner and outer skin in a few spots and slazing up the crack in the front. To fill the gap, drill a hole in the inner liner, and spooge a bunch of the thickened epoxy into the hole with your syringe or piping bag so it spreads out in the gap. Then let it kick.
Then see what it feels like, of its still all wet lasagna noodle, sorry brah, gotta cut it open and reinforce it.
Sean