Welcome to the Caulking Contractors group of SmartGuy.com. Feel free to interact with other professionals from across the world. You can find professionals, find deals on services, find professionals who might barter, or simple post questions, comments, or suggestions. Caulking is both the processes and material, also called sealant, used to seal joints or seams in various structures and some types of piping. Caulking contractors can use flexible sealing compounds to close up gaps in buildings and other structures against water, air, dust, insects, or as a component in firestopping.