Oil-based polyurethane is a type of finish used to protect and enhance the appearance of wood surfaces. It is made from a combination of oils and resins, which create a durable, water-resistant coating. This finish is known for its rich, amber color that deepens over time, making it popular for furniture and flooring. Applying oil-based polyurethane requires careful preparation and multiple coats for the best results. It typically takes longer to dry than water-based polyurethane, but it offers a more robust finish that can withstand wear and tear. Proper ventilation is essential during application due to its strong fumes.