Saw your post with the JB-Weld comment. Bad Idea. JB-Weld will not adhere to a fuel cell bladder. It will adhere to aluminum, steel and other materials, but not a bladder.
Also, poked around your profile a bit and see you are at UCSD. My son is there also. He is in his 3rd year as a mechanical engineering student. He is also part of the Formula-SAE program on campus. Are you involved with this program? If not and if you are any good at mechanics, fabrication and/or just good common sense with respect to building race cars, you may find their program a lot of fun.