Originally Posted by sisyphus
thanks for responding. sorry, I don't know why I typed greenboard over the cement board. the crack's in the inside corner of the greenboard that I had finished with paper tape and drywall compound. will take your advice. thanks
Hey no problem, take a peice of sandpaper fold it and just run it up and down the corner to take off any inperfections, clean and away you go. And while your at it, take the cover off the fan and see if it needs cleaning.