Blood and other binding agents are combined with fibrous material that gets pushed into the cracks between wood planks. Much more commonly done with types of ta

Blood and other binding agents are combined with fibrous material that gets pushed into the cracks between wood planks. Much more commonly done with types of tars and heavy oil. https://en.m.wikipedia.org/wiki/Oakum https://en.m.wikipedia.org/wiki/Oakum https://www.google.com/search?q=caulking%20ship%20wood%20rope&ie=utf-8&oe=utf-8&client=firefox-b-m https://www.google.com/search?q=caulking%20ship%20wood%20rop...