Polyurethane, varnish, and lacquer are tried-and-true sealants with excellent waterproofing properties. For best results, apply the wood finish at room temperature, ideally between 65 to 70 ...

polyurethane, polymerizing oil, and mineral oil sealants are just a few options, though one of the best products is Waterlox sealer and finish, a mixture of tung oil and resin that leaves wood ...