Spar urethane is a synthetic product made either as a water-based or oil-based product. The drying mechanism is identical however ... Buy two quarts of Marine varnish one gloss and the other the sheen of your choice. Spar Urethane vs Polyurethane: Difference â Pros â Cons. Polyurethane: Polyurethane is a finish/sealant that has a very similar application and appearance to varnish, and therefore the two are often used interchangeably. We use it on wood that will receive much wear and tear like flooring. Blog Marcus Gatley. I would use a marine grade spar. Epoxy is, however, prone to UV damage, so the overcoat of varnish provides essential UV protection. Thermoplastic Polyurethane (TPU) Another polyurethane material great for use in the maritime industry is thermoplastic polyurethane, or TPU. Unlike polyurethane, varnish is designed for outdoor projects and is not typically used for indoor surfaces such as a hardwood floor. Varnish is typically a glossy finish, but flattening agents can be added. Shop a huge collection of marine varnish vs polyurethane for sale. You may also think of polyurethane as urethane, but they are actually two different components. Top coating polyurethane with marine varnish on exterior doors. Polyurethane is a water- or oil-based plastic resin used for coating wood or as a wood finish. This article compares the two in terms of pros and cons, application and equipment, and maintenance and clean-up. Tweet. Pros: Cetol is easier to apply than varnish (put on 3-4 coats, no work in between coats) It's easier to remove than varnish ; It lasts 2-3 years before you need to re-touch (varnish lasts 6-12 months) Cons: in general, varnish has a deeper and richer look vs. cetol Two of the most popular are polyurethane varnish and tung oil stain. Pin 1. Studying spar varnish vs spar urethane â the differences we come to the conclusion that both these components are used for similar reasons. Water-based polyurethane can have less of an offensive odor when compared to oil-based products, but floors require at least four coats to achieve the desired level of protection. Some varnishes may even contain polyurethane. For marine use, where sunlight (UV) can damage the wood and the finish, UV absorber chemicals are added to spar varnish to slow the UV damage. It is an elastic, durable and easily processable substance, well suited for wire and cable coatings, engine tubing, drive belts, hydraulic hoses and â¦ Get marine varnish vs polyurethane! Most likely the clear sealer or polyurethane will end up peeling and flaking off the stain. Spar varnish must be reapplied periodically as it will chip, flake or chalk off over time. Purchasing one with maximum UV (Ultra Violet Light) protection is important. Polyurethane Varnish Polyurethane Clear Finish (Amazon) Polyurethane varnish creates a tough surface once cured. Polyurethane differs from varnish in many ways that donât matter to us very much, namely the way it is made, and the chemical process it goes through to âkickâ. It has a high degree of heat resistance, as well. There are plenty of products that are truely varnish that don't have polyurethane as an ingredient. Here's the trade-off. Marine spar varnish and exterior polyurethane finishes usually soak into the wood a little bit, but mainly build up on the surface. Varnish is a hard, transparent topcoat that we use to coat wood. Water-based spar urethane has easy cleanup, less fumes and dries in a short time period. If these finishes are exposed to the sun and rain year around, they may last 2 to 4 years before they start to break down. Traditional varnish (sometimes called Spar Varnish or Marine Varnish) is a resin in an oil base with solvents. Oil-based spar urethane requires several hours between coats. Even the humidity in the air will make wood swell and since a polyurethane is a harder finish is more likely to crack because of the weather. 5 Shares. Wood varnish is an effective means to âwear-proofâ any wooden materials on your sailing vessel, ensuring ongoing protection from water damage, mould, and mildew. As a woodworker, you will come across situations regularly where you have to apply finish to wooden surfaces. Polyurethane is a term used when isocynates are included in the product. It comes in three shades; Cetol Marine, Cetol Marine Light, and Cetol Marine Teak. Marine (boat) varnish is spar varnish with ultraviolet-light absorbers added to resist penetration by UV rays. Spar Varnish. Spar varnish, sometimes referred to as marine varnish is created specifically for outdoor use. The idea here is that the epoxy adheres better than varnish and is less likely to separate from the wood. Once applied, varnish protects the surface of the wood and imparts a glossy finish. It was sanded, stained and finished with Marine Spar Varnish. I am building a surround for a large soaking tub. 99 Share 4. It is resistant to heat, chemicals, and wear and tear such as scratches. While the terms varnish, polyurethane, lacquer and shellac are commonly used to reference a final finish in general, these products are not the same, nor are they recommended to be used interchangeably. Traditional Varnish and Polyurethane Toxicity Issues. Great job. Polyurethane varnish is highly durable. In the case of air drying polyurethane varnishes the vegetable oil is reacted with isocynates & polyols instead of the phthalates & polyols. While polyurethane is water- or oil-based plastic resin, varnish is older and made from resins, oils, and solvents. While the latter is more concentrated and is limited because of the same, the former is more conventional in nature and can be used more extensively. Can i just apply a very thin coat of Marine Spar varnish over the door without lightly sanding down the old varnish? 99 - $119.99 $ 119 . Varnish vs. Polyurethane November 29, 2016 by jim 1 Comment Here is a great article TinBoats member Johnny put together to highlight the difference between Varnish vs. Polyurethane. Like polyurethane, Varnish is a curing finish. Last but not least, every spar varnish needs to protect itself and the underlying wood from the sun. Susan Rhoades. It creates a finish that looks shiny â¦ Polyurethane vs Urethane vs Shellac. There are many clear wood finishes on todayâs market. Take a bristle or preferable an ox hair brush, and brush the varnish on brushing in one direction going from dry to wet. This type of finish can significantly outlast varnish alone, but unlike a two-part polyurethane finish, it needs frequent recoating. on Jun 6, 2017. Spar urethane vs. polyurethane can be a difficult debate, but polyurethane typically wins when it comes to indoor applications. Regular polyurethane and varnish contain little, if any, UV blocking additives, and that alone makes them a poor choice for exterior application. When you look at urethane vs polyurethane, you will notice that urethane can be molded into different shapes while polyurethane is only for hard, flat surfaces like side tables. It has natural UV protecting properties. Behlen Rockhard, Pratt & Lambert 38, McCloskey Heirloom, Ronan Quick Rubbing Varnish. Spar Urethane. Because of its composition it is can allow wooden surfaces to maintain their flexibility. Oil-based polyurethane is a highly durable finish, but it is also easy to apply. This gives chemical bonds that are superior for chemical & water resistance. This can be beneficial for wooden surfaces, as they will be able to bend and expand and contract as needed. Because of the higher ratio of solids, varnish is less susceptible to ultraviolet light damage. The ravages of time and use of a piece of furniture can be limited by a durable top or finish coat. They are very similar and some people even use the phrases interchangeably. Most varnish is created for indoor use, where the wood and the varnish on it are protected from weather and ultra-violet light. Polyurethane vs. Varnish. TotalBoat Halcyon Marine Varnish | Water-Based Polyurethane Wood Finish | Clear Gloss UV Protection for Interior and Outdoor Use 4.7 out of 5 stars 62 $17.99 $ 17 . Then there are different grades of spar varnish. The painter told me for maintenance I should revarnish at least 6 â 12 months every year. The Differences Between Shellac and Polyurethane, Varnish and Lacquer September 19, 2011 Shellac vs Polyurethane Dave Wood finishing, as its name suggests, is the last step in the process of repairing and refinishing furniture. With polyurethane varnish, you get a clear and hard finish that comes in gloss, satin, or matte. If you want real varnish, then you have to accept it will take all damn day to dry, but it's an honest coating, easy to repair, over coat, blend, etc. Lowes sells a Cabot brand marine grade spar that is pretty good but the best would be Epifanes. We all know that furniture has to be protected especially wooden ones and if you leave it outdoors to stay all the time. Marine spar varnish with UV protection. Many marine varnishes are made with phenolic or polyurethane resin and tung oil because these provide the best resistance to water. Member Since: 11/06/02 ... polyurethane vs. tung oil. Without UV protection, varnishes and wood quickly break down and fail. Piffin. Varnish, whether it contains alkyd or polyurethane resin -- or a combination -- is an example of a curing finish. Marine Spar Varnish. Be sure to stir well when using these flattening agents. Many woodworkers turn to oil-based polyurethane because it is the more durable out of the two options. 03:09PM | 04/08/03. While polyurethane is a synthetic material, tung oil stain is organic and made from the pressed seed extract of the tung tree. Varnish is an older type of finish made from resins, oils, and solvents, but very often, the term "varnish" is misused as a generic name for all types of wood finishing. Reply. Helpful. Comparing a highly modified alkyd base like the MinWax Spar Varnish (which truly sucks compared to real varnish) to a fast drying polyurethane just isn't comparing apples to apples. But, to my eye, this looks almost as nice as varnish. Spar marine varnish is a natural oil based product that is designed to protect wood. 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