Man shopping for caulk and caulk gun at a hardware store. - Jasen Wright/Shutterstock Caulk deserves a place in every DIYer's supply kit. Whether you're filling gaps in your baseboard trim, sealing a ...

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 ...