At McMaster, think about it... You want flexible neoprene so get some w/ a low firmness. Make sure that it is CLOSED cell neoprene. A high compression value will be helpful if you're getting thick stuff. As far as ahesiveness, that depends on what you're using it for. For sticking on the back of a mobo, adhesive neoprene can be good, but if you're trying to make a gasket, maybe it would be better to go w/ normal stuff.
Also, for the silicone, search for Dow Corning... I think that brings up some of the conformal coating. I'm not sure though. Hope I was of some help to ya.
-Kev
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