Make a natural oil finish with one part linseed or linseed oil, one part mineral alcohol and one part polyurethane. Use a combination of dye sealants that give the wood a little color and a durable finish, all in one. The first step is to sand the furniture. Sanding, even slightly, will remove the existing top layer and allow the new wood sealer to adhere better.
Start by staining the wood with a waterproofing dye. This will help protect the wood from moisture and will also give it a protective layer. Once the stain is dry, apply a layer of sealer to the top. The sealant will have to be reapplied every few years, but it will help keep the wood in good condition for longer.
Then lightly sand the wooden furniture with fine-grained sandpaper. If you are going to apply wood stain to your furniture, you should do so after cleaning and sanding the wood, but before applying the sealant. Use a brush to apply the dye. Your wooden furniture is now ready to dry.
Allow it to dry for at least 24 hours before exposing it to wet or wet conditions; if rain is expected, cover the furniture with a tarp to protect it from rain.