I wouldn't after the primary, good possibility, especially with a mead to keep fermenting albeit slowly. You might end up with some carbed mead, or worse yet if there happened to be any weak points in the glass carboy = giant bottle bomb and,,,booom.
My dad actually had this happen to him, I was about 9-10 and in the middle of the night he hears what sounds like a shot gun going off, his immediate thought was....they've found me. He gets up, goes to the spare bedroom and the room was covered in red...chokecherry wine, glass shards and all stuck into the wall. I was right next door in the other bedroom and slept thru the whole thing, of course back then I could sleep thru a train wreck. What I do now when bulk aging is fill the airlock with vodka, put the cover on and that comes with the airlock, and tape over all but one of the holes, if you get the airlock that doesn't come with a cover, just tape over the top with scotch tape and poke a hole in it with a needle, this will prevent evaporation of the vodka.