When I left Finland I guess I had a bit of an expedition beard so I got the "random" extra security checks. When I got home I found a note in my ski bag saying they had taken out my little bottle of emergency spray glue for skins. Having flown with it before with no problems, and it being no more dangerous than a can of deodorant (a benign material with a propellant) I didn't think anything of it. It isn't a flammable liquid, and the only place I can find anything about it being restricted is after on a deep search on the airports website.
I just don't get airline security, it varies airport to airport, officer to officer, and whilst I'm allowed several cans of deodorant with propane propellant (which if I remember my youth well is fairly explosive) I'm not allowed a tiny tin of spray glue.
Lesson: Check the airports you fly to for an explicit list of what you're allowed or some Finnish security guard is going to be skiing around on your glue.