I remember once, a hundred years ago, when I was a carpenter at the Univ. of Washington, in Seattle. I was trying to repair a large (are there any other kind at a University?) exit door. I opened a new can of WD40, and sprayed it on a the panic hardware latch. The damned thing would'nt shut off. I mean it just sprayed and sprayed and sprayed. Have you got ANY idea just how much slippery stuff is in one of those cans? I had to close off the exit ... both ways. I had to get helpers with lots of cloth rags, and we wiped and mopped for hours. That was over ten years ago, and I'll bet that place is still slippery ... but I'll bet the door works!