This post contains affiliate links. If you use these links to buy something we may earn a commission. Thank you.There are many ways to weatherproof wood, but most of them do not last. You can apply polyurethane, varnish, lacquer, linseed, Tung oil, or a combination. However, none of these methods last more than 2-10 years (depending on the method and how well it was maintained). Also, these methods can become pricey if you’re trying to weatherproof a large amount of wood. These methods may work