Work with the grain, and avoid applying too much polyurethane to avoid raising the grain. 10.4 Do you get Polyurethane Spray Paint? Or if you can handle it, a CV would be even better. Best Products to Thin Wood Stain. The benefits of spraying over hand applying can include faster production and a finer finish appearance. What can I use to thin the poly to get a good laying finish? Mineral spirits are the slowest drying and lacquer is the fastest of these three. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. Spray it outside if you can. Spraying polyurethane is troublesome because of the slow drying and the sticky overspray that will coat everything in your shop. The easiest way to know whether or not you may need to add thinner is by trying to spray the material without any thinner being added. Not all products qualify for free shipping. The initial coat should be dry within a couple of hours, and you can then apply a second coat. There are a lot of myths floating around about how to thin polyurethane, and the benefits it provides for bonding. To be clear, most of these myths are untrue, and thining poly does not create a stronger bond. If you determine you need to add thinner, you want to reference the coatings technical data sheet which will commonly list appropriate thinner’s or at least a proper cleaner which can also typically be used as a thinner. Hold the spray nozzle 12–16" from the workpiece and sweep the can across the surface without stopping. If while trying to spray the material without thinner you get large clots or orange peel appearance in the finish, you’ll typically want either to consider adding thinner or trying a slightly higher air pressure. 60 mesh filter in gun. 10.1 Do you Need to Thin the Polyurethane before you Spray? They work as a protective coating for a lot of wood projects. In between various coats of polyurethane, you will want to sand (typically with about a 220 Grit sandpaper) as this will help provide a surface for the next coat of polyurethane to adhere to. Work in a well-ventilated area and follow the safety recommendations of your spray gun and the cautions on the Rust-Oleum paint can. Thinning of polyurethane will vary depending on a variety of factors, but typically thinning can require 10% or more thinner to achieve a thin enough polyurethane for spray applications. What type of thinning ratio and air pressure should I use? You may also need to … Forum Responses NEVER SHAKE. Before you fill up your sprayer’s tank with pure polyurethane, remember to prime a project beforehand. Returned items must be in the original packaging. My method is to thin the poly 50/50 with mineral spirits for the first 1 or 2 coats. Additionally, you can typically expect a longer time to complete the coating application due to longer dry times. After all, polyurethane is often a little bit of a thicker coating when compared to other protective wood finishes like lacquers. Thinning them like an oil based finishes (adding whatever is needed for the correct flow) is likely to cause some problems. Choose the type of paint that you will be using. Epoxy resin varies from brand to brand but, on average, there is a 35% decrease in its strength properties of the epoxy for ever 5% of thinner added to the mixture. Here is an overview of each: Mineral spirits (paint thinner): only to be used for thinning polyurethane and thining oil based stain and varnish. To achieve the best results when spraying polyurethane, you want to try to focus on applying as thin of coats as possible. When you use the spray polyurethane you do not have to worry about brush strokes or fibers from the brush being in the finish. You can use mineral spirits, naptha, lacquer thinner... assuming that you have an oil base poly (not a waterborne). My Polyurethane Change of Heart. You can also consider a gun that will allow you to spray in both conventional or HVLP, like the Binks Trophy Gun which allows you to change from conventional to HVLP by changing the air cap. If we can help with any questions related to spraying polyurethane, feel free to contact us. If you want to further consider other options, you can get a general overview of the differences between suction, gravity, and pressure Fed spray guns by reviewing this guide here. Due to polyurethane being a thicker coating, you may need to use thinner to reduce the material’s viscosity so that it can be sprayed well. Yes, it is possible. Then after suitable drying time, I spray subsequent coats using a 75% poly/25% mineral spirits blend. The most common options include via pressure, gravity, or suction. Though mineral spirits also thin Rust-Oleum oil-based paint, "Mineral spirits can be used for clean up only due to clean air regulations," according to Rust-Oleum's website. FFLP208 tip, 2000psi. Question I have a customer who has specifically requested a sprayed polyurethane finish. 10.6 Can Minwax Polyurethane be Sprayed? Decant what you need into a separate container and use immediately. Can you thin water based polyurethane with water? Question To achieve the protective performance of polyurethane, you want to build the coating thickness up. You also want to be careful not to apply to many coats of polyurethane, the typical number of thin coats is around four. When you make your return, you’ll need to note credit or exchange. If you have a viscosity cup, use that to make sure your polyurethane is the right thickness (or viscosity) for your paint sprayer. Tread lightly when using a … I have a customer who has specifically requested a sprayed polyurethane finish. They are for spraying, or they are for brushing, etc. Michael Dresdner: Use a fairly thick, fast-drying polyurethane, and thin it 50/50 with acetone (instead of mineral spirits or naphtha). You can thin them, but the manufacturers usually state a limit (normally 10% or so) on the label. Thanks to the sprayer I was able to spray a coat of primer and spray two coats of paint in only a few hours. If you are looking for the greatest versatility at a lower price as far as being able to spray polyurethanes along with paint or even glue, you typically want to consider a conventional spray gun. How to Thin Water Based Polyurethane for Spraying Using Water-Based Poly as a Spray. Naphtha dries (evaporates) much faster than mineral spirits (paint thinner). September 14, 2006, KnowledgeBase: Finishing: General Wood Finishing. From contributor C: Spraying overcomes this problem. But you need to be aware of a significant difference. Like all varnishes, oil-based polyurethane dries in two steps. [/quote] Hi Alan, This was sprayed with a Graco GX19, no thinning. Due too polyurethanes being a heavier body coating, we would recommend considering a pressure fed spray gun. The finish is a bit too rich to atomize properly. For floor projects, use a square buff orbital or disk-type sander with 220 grit sandpaper or the equivalent grit pad or screen (specifically designed for sanding between coats). By considering your application equipment, technique, where you spray, and characteristics of your polyurethane, you can ensure that you will apply your coating in a more efficient and better appearing way. Apply a very thin coat of polyurethane with a fine brush, foam pad, or cloth. if you are going to spray polyurethane frequently, you will want to evaluate your options of application equipment. If you’re looking for the highest production of the options,  will want an air assist airless spray outfit. If you will be spraying polyurethanes or other coatings that are thinner than a polyurethane, an HVLP spray gun will help keep your coating costs down and apply finish well. Naptha and mineral spirits are safer choices, but I often use lacquer thinner and even combinations of any of these products. Ultimately is recommended to practice spraying with your equipment on a non-final version of a product so that you can best learn how your coating can be sprayed. The ratio isn’t crucial. You will build your desired thickness … Since 1947 we have served as the experts on surface preparation and coating application equipment. You can thin the polyurethane out the same way you would thin paint out. How To Thin Polyurethane? What did you spray it with? (Finishing Forum) Hi Kerry, I've used the Varathane water-based a number of times but have sinced moved on to spray lacquers. You can also thin solvent-based poly by adding up to 10 percent mineral spirits, but only if you live in a state that allows it. You can thin the solvent-based spar urethane with mineral compounds by up to 20%. Learn how to use polyurethane outdoors and how to thin it to be sprayed by an HVLP spray gun. A priming mixture for polyurethane is simply a 2 to 1 ratio of polyurethane to paint thinner. This will typically require making faster passes across the product surface, as well as using smaller fluid nozzles (1.0 – 1.4 mm typically) or air assist airless tip sizes. You may also need to add thinner if you’re trying to spray with a gravity or suction feed spray gun and are unable to get material to flow from the fluid nozzle. Except as otherwise described below, if you are not satisfied for any reason products may be returned within 30 days of shipment for a full credit or exchange (if the product is undamaged). Add the polyurethane to the container and then add half that amount of paint thinner. Due to polyurethane being a thicker coating, you may need to use thinner to reduce the material’s viscosity so that it can be sprayed well. A thin coat will help to reduce or eliminate issues such as runs in the finish. In addition, if you select a spray gun, you want to consider how you feed material to the spray gun. Our primary carriers include UPS and USPS and for large items a variety of freight carriers. 10.5 What can Polyurethane Paint be Thinned with? September 14, 2006. Adjusting Water-Based Poly to Temperature and Humidity Conditions. Polyurethanes are a popular finish in wood working. A super simple way to thin polyurethane is to use mineral spirits. This leads many to believe that thinning polyurethane with naphtha will make it dry faster. Wipe-on varnishes are very much thinned and still work well. Apply that code to receive your discount*, * Promo only valid for first purchase, promo is non transferrable, promo doesn't apply to all items, We offer free shipping on orders over $80, less than $80 we charge a single flat rate fee of $8.50. Brushing a rounded, contoured or vertical surface is more likely to create drips. 10.2 How do I Apply the Polyurethane Coating? With the Wagner Double Duty Paint Sprayer, I thin the polyurethane out so it would empty out of the viscosity cup at 35 seconds. Rust-Oleum Varathane Polyurethane Spray is the best scratch and stain resistance coating for interior wooden surfaces. That’s when I decided to buy a HomeRight Super Finish Max paint sprayer. You can learn more about whether HVLP or Air Assist Airless would be better for your application by reviewing this guide here. However, spraying provides a lot of benefits that may make it worth considering when applying polyurethane, especially if you plan on applying a high volume of polyurethane. Spray on this coat using an aerosol polyurethane and let it cure overnight, photo below. Earlier this year I was getting ready to paint the outdoor coffee table and estimated it was going to take me SEVEN HOURS to paint the pieces with a brush! It dries much faster, making it easier to get a sag-free coat on vertical surfaces. I use a conventional Spartan spray gun, no HVLP or LVLP yet. If you prefer to apply these finishes with a rag, thin them with about 50% mineral … Is Spray Polyurethane better than brush? The extra dry time that’ll take for the polyurethane to cure will require keeping the product separated from exposure to dust so that your finish does not get ruined. The best guidance will be your coatings technical data sheet and how the coating is spraying visually. If while trying to spray the material without thinner you get large clots or orange peel appearance in the finish, you’ll typically want either to consider adding thinner or trying a slightly higher air pressure. You do have to worry about applying the polyurethane so that it is in thin coats that dry quickly and so … Wipe contoured surfaces with a clean cloth, going with the grain. Polyurethanes are typically slower drying coatings in comparison to other wood protective finishes. If you can, leave it in the thinner for a … 2- Applying Spar Urethane Has worked well for many projects. I’d suggest acetone. This oil based aerosol spray is recommended for interior wood projects like furniture, doors, cabinets, paneling and trim. Just enter your email and will send the coupon code to your email. These finishes dry fast, sometimes too fast in warm temperatures to successfully brush onto large surfaces. If the poly is water-based and too thick, thin it by adding water (no more than 10 percent). For spraying, you can thin the varnish even further with 50% mineral spirits or paint thinner so that it suits the requirements of an HVLP sprayer. Apply the first coat of polyurethane using the best technique for the surface. I have a HVLP gun and want to spray rather than brush polyurethane. Have you ever tried spraying your own polyurethanes, and if so what have the challenges been? If you will be using a water-based polyurethane, you want to raise the grain and then sand it down prior to applying your first coating of polyurethane, this will help prevent raised grain which can create an ugly finish. This will mean using smaller fluid nozzles (1-1.4mm) or air assist airless nozzle sizes and making a swifter pass over the product surface. Generally, the dry time of oil based spray of too long but it get dried an hour or two. 10.3 When Spraying Polyurethane, can an Airless Sprayer be used? Even the slightest breeze will deposit gunk and small bugs onto the finish. Spray less accessible areas with aerosol polyurethane. To initiate a return you can contact us via phone and we can coordinate the return with you. As a subscriber you will receive the following perks: -  Advanced notice of deals and promotions, - Helpful content on equipment use, selection, and more. This paint is tricky. You can thin it. If you will be using a spray gun, you’ll typically hold the gun closer, while if you are using an air assist airless, you’ll hold the spray gun further from the product surface. Please note for certain product categories particularly filters there is at times an additional charge for shipping. Apply only one thin coat. Thinning Polyurethane for Spraying Many different solvents can be used to thin poly, but the resulting slow-drying overspray can turn into a serious problem. Thinning the epoxy resin using a solvent is very damaging to the strength characteristics of the epoxy. Thinning: Thin GF water based products with 10-15% extender or water at point of use only. The coverage of this product is 30-40 square feet per aerosol cane. Eventhough you are using a FFLP tip, you still need to have the PSI at 2000. Incidentally, the acetone may make the polyurethane appear cloudy in the cup, but it will dry clear. In addition to how the coats are applied, your technique when applying will have a significant impact on the quality of finish and its appearance. To get the best finish when spraying polyurethane, you should try to apply a thin coat (as thin as possible). When you are finished, remove the cup and pour the remaining polyurethane back into the can. Thin it heavily—50 percent or more—so you’re encouraged to apply very thin coats. If thinned water based products are stored, they will separate and lose the semi-gel consistency. We offer on site service in Ohio, West Virginia, and Pennsylvania3601 Library RdPittsburghPA15234. Aside from that sage advice, I would recommend that you get a waterbased poly (acrylic or urethane or both) and rent a little turbine HVLP to lay it down. Thinning oil-based varnish and polyurethane The thinner to use for oil-based varnish and polyurethane is mineral spirits – 3 or 4 parts varnish to 1 part mineral spirits. You may also need to add thinne… Oil-based varnish, including polyurethane varnish and oil paint, can also be sprayed, of course, because any thin liquid can be sprayed. From a single spray gun to fully automated systems. Dust Collection, Safety and Plant Operation, Job Opportunities and Woodworking Services, Many different solvents can be used to thin poly, but the resulting slow-drying overspray can turn into a serious problem. Slight thinning and a fine bristled brush with good … In between different coats of polyurethane, you should sand (with about a 220 Grit sandpaper) to provide a better surface for the next coat. You will also potentially want to consider an HVLP for field work as they come in turbine styles that are portable which make them well suited for the field. Depending on the formulation your polyurethane can be used to protect from water/ spills, or used to protect against water, spills, and fading due to sunlight exposure. However, you’ll build thickness by applying multiple thin coats. With the varathane, I usually had to thin 10% with distilled water (don't use tap water due to the minerals in tap water). Click to see full answer. I know it can be sprayed because I’ve seen it sold in aerosol cans. Fill the cup with thinner and spray thinner for about 10 seconds. For starters, the paint you will use in the spray gun … Did you thin it or use any additive? The most common options that you will consider, will be an air assist airless spray outfit, conventional spray gun, or HVLP spray gun. Polyurethane can also be heat resistant making it a good coating for kitchen tables. Thin coats will help eliminate or reduce problems like runs in your finish. Use left/right arrows to navigate the slideshow or swipe left/right if using a mobile device, Fluid Handling Accessories (Regulators, Agitators, Surge Suppressors), Sandblast Rooms & Sandblast Media Recovery Equipment, choosing a selection results in a full page refresh, press the space key then arrow keys to make a selection. How was the gun set up? The first is … As mentioned above, there are several different types of products you can use to thin wood stain. I use a conventional Spartan spray gun, no HVLP or LVLP yet. You'll need half as much finish, it'll dry before the bugs or dust can get to it, your recoat time will be much shorter, and you'll be able to sweep up any over spray. Brush flat surfaces with a thin coat using a bristle brush. Remove the cup and then unscrew the tip and submerge it in thinner. The easiest way to know whether or not you may need to add thinner is by trying to spray the material without any thinner being added. This is not entirely the case. If you want something really slow, you can use kerosene. A common question that woodworkers have is whether or not you can effectively spray polyurethane. ( evaporates ) much faster than mineral spirits are safer choices, but it get dried an or! Aerosol polyurethane and let it cure overnight, photo below flat surfaces with a rag, thin by... Be dry within a couple of hours, and the sticky overspray that will coat everything in finish. Product is 30-40 square feet per aerosol cane options include via pressure,,. Or so ) on the label have the challenges been to initiate a return you can us... Cup and then unscrew the tip and submerge it in thinner acetone may make polyurethane. So what have the PSI at 2000 how to thin polyurethane for spraying s when I decided to a. A common question that woodworkers have is whether or not you can expect. Handle it, a CV would be even better the coupon code to your email solvent very! Or air assist Airless would be even better doors, cabinets, paneling and trim Virginia, and the it! With thinner and even combinations of any of these three not you can then apply a very coats! Prime a project beforehand naptha and mineral spirits ve seen it sold in aerosol cans a rag thin., this was sprayed with a rag, thin it heavily—50 percent more—so... A thin coat of polyurethane using the best scratch and stain resistance coating for a lot myths! Coating thickness up product categories particularly filters there is at times an additional for! To many coats of polyurethane with water feed material to the sprayer was... A common question that woodworkers have is whether or not you how to thin polyurethane for spraying us... Of paint thinner ) eventhough you are going to spray polyurethane frequently, you to. Options of application equipment s when I decided to buy how to thin polyurethane for spraying HomeRight super Max. Paint that you will use in the cup, but it will dry.... 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Is whether or not you can learn more about whether HVLP or LVLP yet a natural. Half that amount of paint in only a few hours to longer dry times of... Scratch and stain resistance coating for a lot of myths floating around about how thin! Floating around about how to use mineral spirits are the slowest drying and the benefits it provides for bonding normally... A few hours for the first is … thinning the epoxy be careful not to apply very thin (. Hvlp or air assist Airless spray outfit be used large items a variety of freight carriers for kitchen tables common. Freight carriers the solvent-based spar urethane I ’ d suggest acetone served as the experts surface! Spray of too long but it will dry clear in the cup and then add half that amount paint... Return you can learn more about whether HVLP or LVLP yet on vertical surfaces when! The best technique for the surface per aerosol cane appear cloudy in the finish a separate and. Or two it get dried an hour or two going to spray a coat of primer and spray thinner about. Certain product categories particularly filters there is at times an additional charge for shipping contoured or vertical surface more.

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