A high-gloss product that is used for outdoor applications, including wooden furniture.It is also known as marine varnish.
Best Answer: Spar urethenes and spar varnish are different formulations. Urethene, naturally is a urethene based product, whereas varnish in the traditional formulas had linseed oil as well as various hardeners. On the old formulation the varnish never completely dried. This was so it would not dry hard and crack when exposed to great heat, UV light and salt water. Spar varnish is a high-gloss product that is used for outdoor applications, including wooden furniture. It is also known as marine varnish.. This type of varnish is made to provide protection from changes in temperature, as well as the sun's ultraviolet rays.  Marine Spar Varnish and Brightwork. The varnished wood on many boats is referred to as Bightwork. You can have just a few pieces of brightwork such as hand rails, toe rails, transom or your whole boat can be finished brite.  Spar varnish was originally developed for coating the spars of sailing ships. These formed part of the masts and rigging, so they suffered a hard life in service. They were flexed by the wind loads they supported, attacked by sea and bad weather, and also suffered from UV degradation from long-term exposure to sunlight.  Spar Varnish. Spar varnish is made with a base of natural oil such as tung, linseed or soya. The oil is combined with resins, solvents, UV protector and driers to create a shiny surface. Spar varnish protects the wood from water, heat, stain and solvent discoloration. Spar urethane is a synthetic product made either as a water-based or oil-based product. Water-based spar urethane has easy cleanup, less fumes and dries in a short time period. Oil-based spar urethane requires several hours between coats. A thin application is required to prevent drips. Save. lucato/iStock/Getty Images. Spar urethane is a protective clear coat finish that has been specially formulated to use on interior or exterior wood surfaces exposed to water, sunlight, or changes in temperature. The UV blockers contained in spar varnish, help to reduce the effects of fading or graying caused by the sun. The protective barrier spar urethane forms against moisture makes it a perfect choice to use on exterior wood surfaces. It has the ability to expand and contract with the wood during seasonal and temperature changes. Spar varnish is an older formulation of varnish vs. Urethane Varnish is a modern formulation of a tough clear coating used primarily on wood surfaces exposed to outdoor conditions. Urethene, naturally is a urethene based product, whereas varnish in the traditional formulas had linseed oil as well as various hardeners. On the old formulation the varnish never completely dried. This was so it would not dry hard and crack when exposed to great heat, UV light and salt water.
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what is spar varnish