In the ruins of a health-care system, many medical facilities have become graveyards. Doctors continue to deliver lifesaving care—but they risk their own lives in the process.

We put eight caulks and sealants to the test in our labs—we evaluated cure time, durability, adhesion, and more I’m a renter so I’ve never had to caulk a bathtub or seal a joint in concrete, but I’ve ...