For outdoor wood benches, finishes like polyurethane, spar varnish, and marine-grade sealants work best. These finishes provide excellent protection against moisture, UV rays, and temperature fluctuations. Spar varnish is particularly suited for outdoor use because it remains flexible as the wood expands and contracts with changing weather. Oil-based finishes, such as tung oil or teak oil, penetrate the wood and offer a natural look while providing good moisture resistance. Regular maintenance and reapplication are essential to keep the bench protected.
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