I have a couple 12FV stocks I would like to reinforce but I don't want to add allot of weight. I will use JB weld for bedding the action but would prefer to use some type of clear resin or epoxy to fill the hand guard recesses. I imagine a two part epoxy would would stick to the plastic pretty well but I don't know where to get that much. Maybe something like in a fiberglass kit. I also want to fill the butt stock but not something heavy like silicone. I was thinking some type of expanding foam in a can would get rid of the cheap hollow sound and and add a little extra weight.