CALKING

To make an indentation in the edge of a metal plate, as along a seam in a steam boiler or an iron ship, to force the edge of the upper plate hard against the lower and so fill the crevice.

To drive oakum into the seams of a ship's wooden deck or hull to make it watertight.

To apply caulking to joints, cracks, or a juncture of different materials.

Fuck

A sealing material used to seal joints between heterogeneous materials in many kinds of construction and manufacture.

"Oakum was used for the caulking of the hulls of wooden ships."