I havnt glued any visors yet, but for all my armor needs (and many others) I use plumbers goop. You can find it at walmart for a few bucks. Its awesome. Ive used it on my TK armor and everything I put it on has held great (glued longer than a year ago). Ive also repaired shoes, books, and other various things with it. It holds fantasticly but if you absolutly have to get it off, it can be ripped off with some effort. I would sugest that. I fully intend to use it for my visor when it comes in.
-Tony Vida; TK 3204; Austin, Tx