Polyurethane vs Varnish. Generally, the varnish is different from regular polyurethane. It is designed for outdoor projects like decks and exterior furniture, while general polyurethane is meant for indoor use like hardwood floors or table-tops.But those forms of polyurethane that are mainly built for outdoor use (mostly made of oil) have a close relation, instead of differences, with varnish.. 1. TotalBoat Gleam Marine Spar Varnish. It is arguably the best varnish for wood that you can shop for, especially if you are a sailor. This formula is a certified marine grade varnish with UV inhibitors, phenolic resins as well as Tung oil. It gives your wooden surfaces an impressive, bright color finish.

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Spar varnish and regular varnish are very similar though they do have some striking differences

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An incredibly durable outdoor finish using epoxy and marine varnish. Used outdoor furniture

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Woods for outdoor projects. The three most widely available and suitable exterior lumber choices, not treated with chemical preservatives, include Western red cedar, redwood, and cypress. Your geographic location will determine the availability and cost of these materials. Redwood, for example, is widely available and used in the western United.. BEST SOLID: SaverSystems #1 Deck Wood Deck Paint and Sealer. BEST SEMITRANSPARENT: SaverSystems #1 Deck Premium Semi-Transparent Stain. BEST CLEAR: Wolman Raincoat Clear Oil Base Sealer. BEST ECO.