Kaitsevarvast

Kaitsevarvast refers to a type of varnish used by the Estonians in the past, primarily for the protection of wooden submarines, known as Unterseeboote in German, during World War II. These small submarines were an integral part of Estonia's naval forces, and to extend their lifespan and maintain their effectiveness, the submarines were treated with the varnish.

Under the varnish, the wooden hulls of the submarines were considered a "source of strength". Before they were sent into the Baltic Sea for combat, they were treated meticulously. The process of applying the varnish was not just a routine maintenance task but a meticulous process, and applying it was considered a manner of "arming the vessels" for the final test.

Though information on this specific topic may be scarce, and most information may be outdated, the overall interest in the preservation and plasticization of wooden boats has grown in recent years. However, the process of preserving historical wooden boats using kaitsevarvast has decreased due to its complexity.