I've said this before, just buy a shitload of
UV-activated LOCA glue. It's the stuff they use to glue cell phone's glass to the screen. Kind of expensive for that much, but hey, that's the price of 'safety.'
Game is hard.
Also, while I agree that the mushy stuff between the CRT and the safety glass does definitely add some protection... I'm pretty sure that if the tube wanted to implode, anybody in the vicinity would have a really bad day, whether or not it had the mushy stuff.