spar varnish

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noun

a durable, weather-resistant varnish applied to unpainted wooden areas, especially on ships.
a varnish made from sulfur, rosin, and linseed oil.

Origin of spar varnish

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for spar varnish

Historical Examples of spar varnish