Caulk is a waterproof sealant used to fill in cracks and gaps around sinks, tubs, windows, counters, and more in your home. Depending on the type of caulk you use, you can also use it outdoors to seal ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Caulk is used to create a waterproof or insulating seal between building materials.

Joints around windows and between masonry panels in public buildings erected or renovated during the 1960s and 1970s were often sealed with a caulk containing polychlorinated biphenyls (PCBs). The ...