First, spar urethane can vary significantly in quality from manufacturer to manufacturer. You may need to thin it with mineral spirits first. If you are more concerned about your overall health or the environment, water-based polyurethane may be the better option for you. Many woodworkers turn to oil-based polyurethane because it is the more durable out of the two options. On the other hand, polyurethane has slightly less oil and can be a little less pliable. It also contains some additives that make it great at dispersing ultraviolet light. Other differences are found in the actual application of the products themselves. Polyurethanes are commonly available in both oil-based and water-based formulas, and there are minor differences between the two in both performance and application. Danish oil’s soft finish makes it unsuitable for items that take a lot of abuse or that are subjected to frequent spills, such as floors, tables and chairs. Watco Danish Oil vs. Polyurethane for Wood Finishing. A table is one of the most common pieces of furniture that woodworkers are asked to create. For the spar urethane, you will need to dilute it with half mineral spirits and half spar urethane. Because they dry slower, you also run the risk of dust and other particles getting in the finish before it is completely dry. This product has been characterized as one of the best water based polyurethane for furniture. Watco Danish oil is a brand of wood finish product also referred to as an oil/varnish blend, because it contains both penetrating oil … Polyurethane gives you a slightly longer working time so that you can go back through to eliminate any brushstrokes. 1960s. Both types of finish can also be applied using a wiping method. They are not the most environmentally-friendly products available on the market today. It dries with exposure to circulating air, a process known as oxidation. This type of finish is considered to be one of the most versatile forms of finish on the market today, and it can be purchased in many different forms. The finish may actually be degraded when these chemicals are used to clean the surface of the wood. Because this piece of wood must stand up to extreme moisture and wind, spar urethane was created to withstand the same conditions and to protect the spars of the ship. You may not be surprised to learn that spar urethane, as it is sold today, is also great for use on outdoor furniture products. Polyurethane requires up to 72 hours before it is fully cured, and because of its long drying time, it tends to pick up bits of dust and hair, which can ruin the final result. This allows the wood to move naturally, even though the temperatures and humidity levels may vary in its surroundings. For those who are interested in the science behind polyurethane, it is a synthetic resin that is transparent in color and resists abrasion. It also requires a longer dry time, so make sure you allow enough time ahead to apply multiple coats. These heirloom items can last for generations, so you want to make sure that you are using the proper type of finish. The thing with woodwork is that once it is painted, it will always be painted. A water-based polyurethane is a great option for someone who is concerned about the environment. Polyurethane is made by mixing alkyd and synthetic resins with different types of oils. Polyurethane tends to be the favored choice for spraying, as some professionals believe that spar urethane is too thick to be sprayed. Oil-based polyurethane. The same goes for water-based spar urethane. Watco Danish oil is a brand of wood finish product also referred to as an oil/varnish blend, because it contains both penetrating oil … It can be safely used both indoors and outdoors. Spar urethane vs. polyurethane can be a difficult debate, but polyurethane typically wins when it comes to indoor applications. They can be cleaned with a damp cloth and are durable. They also do not crack with use or fade under sunlight. How do spar urethane vs. polyurethane fare when exposed to other chemicals? You may consider using spar urethane or the water-based polyurethane if you must work in an area with very little ventilation. Consider how many coats you might need. Hydrolysis testing measures potential delamination of the fabric. From here, you can apply it to the surface using a clean, lint-free rag. Danish oil is used to finish and protect wood surfaces from moisture. You must evaluate what your project truly requires before making a major decision. Keep in mind that your surface must be completely smooth in order to prevent bubbles and drips when spraying either type of finish. The good news is that you can really use either type of finish to create a beautiful custom tabletop. Oil based, known as solvent-based, polyurethane is very durable and the best option for humid or high traffic areas. On the other hand, polyurethane is resistant to most chemicals, including alcohol. When you need the right materials to finish your next project, you have all sorts of finishes to choose from. Specializing in building and renovating homes, Thomas Luttrell has worked in homebuilding since 2002. Regardless of what product you are working with, you should wear gloves to protect your skin. You can choose from oil-based or water-based polyurethane, along with an assortment of different gloss levels. Press Esc to cancel. Save my name, email, and website in this browser for the next time I comment. Do not cover the surface with rugs until 30 days after the poly has cured. Many people find that this is much more convenient for them and easier to apply, but you will pay for the convenience.