A fresh bead of caulk around a bathtub looks deceptively simple when done right. That clean white line seems like it should take five minutes and require no special skills. The reality is a lot ...

Q: My landlord’s novice repair person caulked around the bathtub — twice. Both times, the caulk pulled away from the wall. Why? And what’s the right way to do it? A: New caulk doesn’t stick well to ...