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Polyurethane Versus Varnish

Question: Is polyurethane as good as a varnish?

Answer: Varnish is much more durable than any of the urethane products, especially much better outside. As an example, wood boats use varnish, not urethane. Varnish stands up to UV much better than urethane, primarily because urethane is a plastic and varnish is the sap of a tree. If it is indoors, then polyurethane will work just fine.