The Collaborative International Dictionary
Boottopping
Boottopping \Boot"top`ping\, n.
(Naut.) The act or process of daubing a vessel's bottom near the surface of the water with a mixture of tallow, sulphur, and resin, as a temporary protection against worms, after the slime, shells, etc., have been scraped off.
(Naut.) Sheathing a vessel with planking over felt.
Wiktionary
boottopping
n. 1 (context nautical English) The act or process of daubing a vessel's bottom near the surface of the water with a mixture of tallow, sulphur, and resin, as a temporary protection against worms, after the slime, shells, etc., have been scraped off. 2 (context nautical English) Sheathing a vessel with planking over felt.