Caulk or caulking is a material used to seal joints or seams against leakage in various structures and piping.
Silicone-based caulk on this upturned bathroom sink will spread smoothly, sealing the gap, when the sink is turned over and installed.
Dried-out caulking on the Severn trow Spry, now displayed on shore
The tools of traditional wooden ship caulking: caulking mallet, caulker's seat, caulking irons, cotton and oakum
A caulking mallet, tar pot and a piece of petrified tar found on board the 16th century carrack Mary Rose
Boat building is the design and construction of boats and their systems. This includes at a minimum a hull, with propulsion, mechanical, navigation, safety and other systems as a craft requires.
The schooner Appledore II under construction
Damaged boat mid-reconstruction; carvel planking partially removed
Caulking irons and oakum
Caulking a wooden boat