HMMM...I'd love to offer a suggestion, but I'm afraid I don't quite follow what you're having problems with. I can say with some certainty, that hot glue is a poor choice for cementing your gauntlet halves together. I'm not familliar with bio-mech's kits or tutorials, but most folks use what is termed, the clamshel method. Basically, you cement the uper & lower halves of your gauntlets together on the outside portion with a strong adhesive. I always use the 2 part epoxy...get the stuff for plastic & fiberglass. That should work well on your sintra. It's best to use small c-clamps to hold the halves together while it dries if you can round some up. then, on the inside halves of the shells, you apply your velcro strips. this will hold the inside edge shut while you wear your gauntlets. Heres a really crummy pic of how it will look.....
As you can see, the inside of the gaunt...(by inside, I mean the open half is on the inside of your arm when wearing the gaunt) has velcro for closure, while the outside is glued solid. THink of it as a clam shell I guess
with this method, the gauntlet should stay on your arm fairly well without the need for velcro anywhere else. Well, I dunno if I've confused you more or if that will help you or not. I hope so If you could post pics of yours it might give a better idea of what your trying to do. And yeah...when you're in a pinch & nothing is working, you can always add more velcro
Damian
