I agree, the motors that I'm using won't really "vibrate," but rather buzz on your bottom. I got a lot of other vibrating motors (with the offset weight), but they weren't enclosed, so as soon as a little pressure was put on them, they stopped. So I decided to go with these since they're enclosed. If anyone else knows where I can get stronger vibrating motors from somewhere that would be helpful (I know that sounds strange..).
I will definately try the epoxy tonight and see how that goes. Thanks for all your replies!