How Do You Make Wood Waterproof?

How Do You Make Wood Waterproof? Use linseed or Tung oil to create a beautiful and protective hand-rubbed finish. Seal the wood with coating of polyurethane, varnish, or lacquer. Finish and waterproof wood simultaneously with a stain-sealant combo. Does primer seal wood? A priming paint has a high solids content that fills the grain in