Caulk is one of the greatest tools of illusion ever invented. We’ve been using it to stop leaks and hide gaps for centuries, and it remains one of the most useful things you can have in your toolbox.

If you have a DIY project on the to-do list that involves some kind of sealant, the seemingly endless options available in the hardware store aisle or online can feel overwhelming when it comes to ...

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 ...