Re: dis-mounting orchids
Yeah, the only commercially-mounted mounts I have are pressed cork, treefern, cedar slabs, and assorted "sticks" (Andy's). The only natural-cork surfaces I have mounts on are those I mounted myself. (Just a few Tolumnia and a Leptotes, neither of which are being moved to a terrarium.) But I've found that the pressed cork has enough nooks and crannies that most fine-rooted orchids work their way in there so they have to be picked out. It's kind of meditative work, though, so I don't mind it.
Re: BSI E.T. - sounds like good stuff; I'll have to look for it. Since I think in your video you advised not to get it wet for awhile after mounting, I'm curious how that works for use on coral? Don't live coral need to stay submerged?