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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]
After a successful run with the product, Z-Spar was sold to a company called Koppers. Shortly after Z-Spar joined Koppers, they would purchase the Woolsey line, merging the two companies under one name. Pettit Marine Paint was established in 1972, after the unification of three lines of marine paint manufactures – Pettit, Woolsey, and Z-Spar. [4]
Exterior use of polyurethane varnish may be problematic due to its susceptibility to deterioration through ultra-violet (UV) light exposure. All clear or translucent varnishes, and indeed all film-polymer coatings (i.e., paint, stain, epoxy, synthetic plastic, etc.) are susceptible to this damage in varying degrees.
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 ...
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.
A spar is a pole of wood, metal or lightweight materials such as carbon fibre used in the rigging of a sailing vessel to carry or support its sail. These include yards , booms , and masts , which serve both to deploy sail and resist compressive and bending forces, as well as the bowsprit and spinnaker pole .