Oakum
Oakum is a preparation of tarred fibre used to seal gaps. Its main traditional applications were in shipbuilding, for caulking or packing the joints of timbers in wooden vessels and the deck planking of iron and steel ships; in plumbing, for sealing joints in cast iron pipe; and in log cabins for chinking. In ship caulking, it was forced between the seams using a hammer and a caulking iron, then sealed into place with hot pitch.
Worm, parcel and serve
The tar, or "slush" is a mixture of Stockholm tar, boiled linseed oil, and Japan drier. Many "recipes" for slush exist, but the intent is always to allow a penetrating coat of preservative pine tar that then cures to a harder finish that will not so easily rub off on sails and crew. The term "slush" is also used to describe the grease applied to the masts to lubricate the parrels so that the yards can raise and lower freely.