To make a wood bench waterproof, first sand the surface to remove any imperfections. Apply a waterproof wood sealant or outdoor-grade varnish. Make sure to coat all surfaces evenly, including the legs and undersides, to prevent water from seeping in. For additional protection, consider using a marine-grade sealant, especially if the bench will be exposed to extreme weather. Allow the first coat to dry completely before applying a second coat for better durability. Regular reapplications of the sealant are recommended to maintain the waterproofing.
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