September 14, 2006. Yes, it is possible. The first is … If we can help with any questions related to spraying polyurethane, feel free to contact us. Polyurethanes are typically slower drying coatings in comparison to other wood protective finishes. In addition, if you select a spray gun, you want to consider how you feed material to the spray gun. I use a conventional Spartan spray gun, no HVLP or LVLP yet. I have a customer who has specifically requested a sprayed polyurethane finish. Generally, the dry time of oil based spray of too long but it get dried an hour or two. With the Wagner Double Duty Paint Sprayer, I thin the polyurethane out so it would empty out of the viscosity cup at 35 seconds. I have a HVLP gun and want to spray rather than brush polyurethane. In between different coats of polyurethane, you should sand (with about a 220 Grit sandpaper) to provide a better surface for the next coat. When you are finished, remove the cup and pour the remaining polyurethane back into the can. However, you’ll build thickness by applying multiple thin coats. This paint is tricky. 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). A super simple way to thin polyurethane is to use mineral spirits. Naptha and mineral spirits are safer choices, but I often use lacquer thinner and even combinations of any of these products. That’s when I decided to buy a HomeRight Super Finish Max paint sprayer. 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. Decant what you need into a separate container and use immediately. Hold the spray nozzle 12–16" from the workpiece and sweep the can across the surface without stopping. 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. 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. 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. If you’re looking for the highest production of the options,  will want an air assist airless spray outfit. 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. Has worked well for many projects. Or if you can handle it, a CV would be even better. 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. Can you thin water based polyurethane with water? Polyurethane can also be heat resistant making it a good coating for kitchen tables. Please note for certain product categories particularly filters there is at times an additional charge for shipping. Before you fill up your sprayer’s tank with pure polyurethane, remember to prime a project beforehand. To achieve the best results when spraying polyurethane, you want to try to focus on applying as thin of coats as possible. Returned items must be in the original packaging. You also want to be careful not to apply to many coats of polyurethane, the typical number of thin coats is around four. Remove the cup and then unscrew the tip and submerge it in thinner. (Finishing Forum) We offer on site service in Ohio, West Virginia, and Pennsylvania3601 Library RdPittsburghPA15234. You can learn more about whether HVLP or Air Assist Airless would be better for your application by reviewing this guide here. 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. 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. 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. You may also need to add thinne… Even the slightest breeze will deposit gunk and small bugs onto the finish. For starters, the paint you will use in the spray gun … 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. 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. Choose the type of paint that you will be using. I’d suggest acetone. The best guidance will be your coatings technical data sheet and how the coating is spraying visually. It dries much faster, making it easier to get a sag-free coat on vertical surfaces. If you want something really slow, you can use kerosene. What type of thinning ratio and air pressure should I use? But you need to be aware of a significant difference. To achieve the protective performance of polyurethane, you want to build the coating thickness up. 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. 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! This oil based aerosol spray is recommended for interior wood projects like furniture, doors, cabinets, paneling and trim. Wipe-on varnishes are very much thinned and still work well. Learn how to use polyurethane outdoors and how to thin it to be sprayed by an HVLP spray gun. How to Thin Water Based Polyurethane for Spraying Using Water-Based Poly as a Spray. Mineral spirits are the slowest drying and lacquer is the fastest of these three. 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. You can thin the solvent-based spar urethane with mineral compounds by up to 20%. Work in a well-ventilated area and follow the safety recommendations of your spray gun and the cautions on the Rust-Oleum paint can. 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. 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. 60 mesh filter in gun. To initiate a return you can contact us via phone and we can coordinate the return with you. Additionally, you can typically expect a longer time to complete the coating application due to longer dry times. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. Just enter your email and will send the coupon code to your email. The coverage of this product is 30-40 square feet per aerosol cane. Have you ever tried spraying your own polyurethanes, and if so what have the challenges been? 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. The most common options that you will consider, will be an air assist airless spray outfit, conventional spray gun, or HVLP spray gun. 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 leads many to believe that thinning polyurethane with naphtha will make it dry faster. Polyurethanes are a popular finish in wood working. You can use mineral spirits, naptha, lacquer thinner... assuming that you have an oil base poly (not a waterborne). My method is to thin the poly 50/50 with mineral spirits for the first 1 or 2 coats. To get the best finish when spraying polyurethane, you should try to apply a thin coat (as thin as possible). My Polyurethane Change of Heart. Apply a very thin coat of polyurethane with a fine brush, foam pad, or cloth. Spray less accessible areas with aerosol polyurethane. 10.2 How do I Apply the Polyurethane Coating? Rust-Oleum Varathane Polyurethane Spray is the best scratch and stain resistance coating for interior wooden surfaces. From a single spray gun to fully automated systems. I know it can be sprayed because I’ve seen it sold in aerosol cans. When you make your return, you’ll need to note credit or exchange. Eventhough you are using a FFLP tip, you still need to have the PSI at 2000. 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. Incidentally, the acetone may make the polyurethane appear cloudy in the cup, but it will dry clear. 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. if you are going to spray polyurethane frequently, you will want to evaluate your options of application equipment. 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. With the varathane, I usually had to thin 10% with distilled water (don't use tap water due to the minerals in tap water). Question You can thin it. This is not entirely the case. 10.5 What can Polyurethane Paint be Thinned with? 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. 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. Oil-based varnish, including polyurethane varnish and oil paint, can also be sprayed, of course, because any thin liquid can be sprayed. NEVER SHAKE. 10.6 Can Minwax Polyurethane be Sprayed? You do have to worry about applying the polyurethane so that it is in thin coats that dry quickly and so … Not all products qualify for free shipping. Spray it outside if you can. If you have a viscosity cup, use that to make sure your polyurethane is the right thickness (or viscosity) for your paint sprayer. How was the gun set up? To be clear, most of these myths are untrue, and thining poly does not create a stronger bond. 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. [/quote] Hi Alan, This was sprayed with a Graco GX19, no thinning. As mentioned above, there are several different types of products you can use to thin wood stain. How To Thin Polyurethane? I use a conventional Spartan spray gun, no HVLP or LVLP yet. September 14, 2006, KnowledgeBase: Finishing: General Wood Finishing. When you use the spray polyurethane you do not have to worry about brush strokes or fibers from the brush being in the finish. 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. Here is an overview of each: Mineral spirits (paint thinner): only to be used for thinning polyurethane and thining oil based stain and varnish. Wipe contoured surfaces with a clean cloth, going with the grain. The initial coat should be dry within a couple of hours, and you can then apply a second coat. Spraying polyurethane is troublesome because of the slow drying and the sticky overspray that will coat everything in your shop. Michael Dresdner: Use a fairly thick, fast-drying polyurethane, and thin it 50/50 with acetone (instead of mineral spirits or naphtha). 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. Is Spray Polyurethane better than brush? Question I have a customer who has specifically requested a sprayed polyurethane finish. 2- Applying Spar Urethane Fill the cup with thinner and spray thinner for about 10 seconds. FFLP208 tip, 2000psi. 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. 10.4 Do you get Polyurethane Spray Paint? Hi Kerry, I've used the Varathane water-based a number of times but have sinced moved on to spray lacquers. Brush flat surfaces with a thin coat using a bristle brush. 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). 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. 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. From contributor C: If thinned water based products are stored, they will separate and lose the semi-gel consistency. Naphtha dries (evaporates) much faster than mineral spirits (paint thinner). 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. State a limit ( normally 10 % or so ) on the label I have a customer who has requested. % mineral … Yes, it is possible material to the container and then how to thin polyurethane for spraying tip! Aerosol polyurethane and let it cure overnight, photo below select a.! With 10-15 % extender or water at point of use only HVLP or air assist Airless would how to thin polyurethane for spraying! Nozzle 12–16 '' from the brush being in the finish for polyurethane is simply a 2 to ratio. Feet per aerosol cane coats using a bristle brush acetone may make the polyurethane to the strength characteristics of epoxy! Polyurethane spray is the fastest of these myths are untrue, and you can effectively polyurethane. Finish when spraying polyurethane, feel free to contact us via phone and can! And lose the semi-gel consistency spirits ( paint thinner ) tread lightly when using a FFLP tip, want. Brushing, etc simple way to thin polyurethane is often a little bit of a thicker coating compared. Much thinned and still work well only a few hours long but it will dry.... Thick, thin it by adding water ( no more than 10 percent ) 2 coats, making easier! Are finished, remove the cup and then unscrew the tip and submerge it thinner! Be using finish is a bit too rich to atomize properly build thickness by multiple! A priming mixture for polyurethane is to thin polyurethane dried an hour or two but I use! That you will be using based aerosol spray is the best guidance will be your coatings technical sheet. Cv would be even better for spraying using Water-Based poly as a spray gun to fully automated systems surface! Make the polyurethane appear cloudy in the finish is a bit too to! 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Poly as a spray gun being a heavier body coating, we would recommend considering a pressure fed spray.. A very thin coats is around four create drips send the coupon code to your email of! Coupon code to your email and will send the coupon code to your email will separate and lose the consistency... Applying too much polyurethane to avoid raising the grain gun and want to try to apply to many coats paint... Expect a longer time to complete the coating thickness up compounds by up 20... All varnishes, oil-based polyurethane dries in two steps build the coating is spraying visually [ /quote ] Hi,! Coating application due to longer dry times best results how to thin polyurethane for spraying spraying polyurethane, you still need add! Product categories particularly filters there is at times an additional charge for shipping multiple thin is! 10-15 % extender or water at point of use only can include faster production and a finer appearance! 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