Good stuff, but not perfect. See Silicone II on the chart at the bottom of the page:
Cyanoacrylates (super glue) is very brittle which doesn't work on flexible plastics, which includes some wall warts. I've glued them in spots around the perimeter, only to have the case pop open when I dropped the wall wart on the floor. I suspect more glue would be better, but have never tried it.