The best way to protect wooden urban outdoor furniture without achieving a high-gloss or plastic-like finish is to use penetrating natural oils or matte-finish sealants designed for exterior wood. Start by ensuring the furniture is clean, dry, and free of previous coatings. For a natural look, opt for products like tung oil, linseed oil (especially polymerized), or specialized outdoor wood oils. These soak into the wood grain, enhancing its natural color and providing water resistance without forming a thick, shiny film. Apply multiple thin coats, sanding lightly between coats for optimal absorption.
For enhanced protection in harsh urban environments, choose a "flat" or "matte" water-based polyurethane or a dedicated outdoor wood sealant labeled as satin or matte. These products contain UV inhibitors to prevent graying and moisture blockers without the artificial shine. The key is in the application: use a cloth or brush to apply sparingly, wiping off any excess before it dries to avoid surface buildup. Regular maintenance—such as an annual light cleaning and a spot application of oil to dry areas—will preserve the wood's natural character and patina while providing robust protection against rain, sun, and city pollutants. This approach maintains the authentic, tactile feel of wood, allowing it to age gracefully with a sophisticated, low-luster appearance that suits modern urban spaces.