Do you know how to caulk—or even what caulk is? It’s something you rarely notice, but there it sits every day doing some pretty important work in your home. Once applied, this thin line of goo hardens ...

Caulk is the inexpensive, easy-to-use problem-solver that seals windows, bathtubs, sinks, siding and closes troublesome joints inside and outside the house. The complication: you only need a tube or ...