I saw something recently in a film and yes I know we're playing Sci fi and so no reason it can't work but I wondered if it was real and if so things like cost and shelf life-
men breaking into a compound with a chain link fence took out an aerosol can, sprayed a line around the edge of it and after waiting a momment pulled and the whole section came apart in their hands creating an entrace without the issue of having to cut each link.
I assume cid would be too dangerous but wondered if it was some hyper cold element.