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System Three Resins, Spar Urethane Varnish Satin Quart System Three Marine Spar Varnish is a high-build coating designed for marine epoxy and exterior wood surfaces such as railings, doors or any surface where a clear, durable gloss finish is desired. System Three Marine Spar Varnish contains state-of-the-art UV absorbers, which will keep wood looking beautiful even with constant exposure to strong sunlight. System Three Marine Spar Varnish is also resistant to scratching and marring, as well as many cleaners and solvents. Marine Spar Varnish can be sprayed with the proper precautions and technique. Refer to the System Three Paint Application Guide for detailed information on spray application.