I was just going to post the same link that Jimmy Da Moose posted. I recommend that as well. If you can at all avoid it, DO NOT hot glue the visor into your helmet. The reason being that once it's in there, getting it out will be next to impossible, especially if you add in resin. With Blackula's method, the visor is removable (which is nice if the visor ever gets scratched or you wish to simply have a different colored visor).