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Without elasticity, the varnish would soon crack, allowing water to penetrate the wood beneath. Prior to the development of modern polymer chemistry, varnish production was rudimentary. Originally, spar varnish was a "long oil" varnish, composed primarily of drying oil with a small proportion of resin, usually boiled linseed oil and rosin. [1]
The Valspar varnish was the company's main product for more than 30 years. The advertising tagline , "The varnish that won't turn white" made Valspar a household name. Famous users of Valspar included Robert Peary in his 1909 expedition, the U.S. military during World War I , and Charles Lindbergh during his 1927 solo intercontinental flight.
Spar varnishes are thus not necessarily the best choice for outdoor woodwork that does not need to bend in service. Despite this, the widespread perception of "marine products" as "tough" led to domestic outdoor varnishes being branded as "Spar varnish" and sold on the virtue of their weather- and UV-resistance. These claims may be more or less ...
Spar varnish This page was last edited on 14 March 2020, at 17:16 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
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Pigments in paints and stains protect against UV damage, while UV-absorbers are added to polyurethane and other varnishes (in particular "spar" varnish) to work against UV damage. Polyurethanes are typically the most resistant to water exposure, high humidity, temperature extremes, and fungus or mildew, which also adversely affect varnish and ...
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