Thinning them like an oil based finishes (adding whatever is needed for the correct flow) is likely to cause some problems. They are for spraying, or they are for brushing, etc. Did you thin it or use any additive? Even the slightest breeze will deposit gunk and small bugs onto the finish. 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. My method is to thin the poly 50/50 with mineral spirits for the first 1 or 2 coats. These finishes dry fast, sometimes too fast in warm temperatures to successfully brush onto large surfaces. Apply only one thin coat. After all, polyurethane is often a little bit of a thicker coating when compared to other protective wood finishes like lacquers. [/quote] Hi Alan, This was sprayed with a Graco GX19, no thinning. The most common options include via pressure, gravity, or suction. Wipe-on varnishes are very much thinned and still work well. You can thin it. 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. 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. You may also need to … FFLP208 tip, 2000psi. Spraying overcomes this problem. Question I have a customer who has specifically requested a sprayed polyurethane finish. But you need to be aware of a significant difference. Polyurethanes are typically slower drying coatings in comparison to other wood protective finishes. 2- Applying Spar Urethane The initial coat should be dry within a couple of hours, and you can then apply a second coat. 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. Generally, the dry time of oil based spray of too long but it get dried an hour or two. Decant what you need into a separate container and use immediately. A priming mixture for polyurethane is simply a 2 to 1 ratio of polyurethane to paint thinner. Has worked well for many projects. 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). Spray it outside if you can. Fill the cup with thinner and spray thinner for about 10 seconds. To be clear, most of these myths are untrue, and thining poly does not create a stronger bond. Naptha and mineral spirits are safer choices, but I often use lacquer thinner and even combinations of any of these products. Slight thinning and a fine bristled brush with good … 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. Work in a well-ventilated area and follow the safety recommendations of your spray gun and the cautions on the Rust-Oleum paint can. Forum Responses 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. If you prefer to apply these finishes with a rag, thin them with about 50% mineral … How to Thin Water Based Polyurethane for Spraying Using Water-Based Poly as a Spray. 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. Is Spray Polyurethane better than brush? They work as a protective coating for a lot of wood projects. Click to see full answer. Can you thin water based polyurethane with water? From a single spray gun to fully automated systems. Then after suitable drying time, I spray subsequent coats using a 75% poly/25% mineral spirits blend. Learn how to use polyurethane outdoors and how to thin it to be sprayed by an HVLP spray gun. We offer on site service in Ohio, West Virginia, and Pennsylvania3601 Library RdPittsburghPA15234. I’d suggest acetone. If thinned water based products are stored, they will separate and lose the semi-gel consistency. 10.2 How do I Apply the Polyurethane Coating? I know it can be sprayed because I’ve seen it sold in aerosol cans. A super simple way to thin polyurethane is to use mineral spirits. You can thin them, but the manufacturers usually state a limit (normally 10% or so) on the label. 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. Additionally, you can typically expect a longer time to complete the coating application due to longer dry times. Wipe contoured surfaces with a clean cloth, going with the grain. 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. Adjusting Water-Based Poly to Temperature and Humidity Conditions. 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. What type of thinning ratio and air pressure should I use? NEVER SHAKE. Thanks to the sprayer I was able to spray a coat of primer and spray two coats of paint in only a few hours. 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. Not all products qualify for free shipping. Spray on this coat using an aerosol polyurethane and let it cure overnight, photo below. That’s when I decided to buy a HomeRight Super Finish Max paint sprayer. Tread lightly when using a … 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 leads many to believe that thinning polyurethane with naphtha will make it dry faster. 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). A thin coat will help to reduce or eliminate issues such as runs in the finish. Yes, it is possible. Have you ever tried spraying your own polyurethanes, and if so what have the challenges been? 10.1 Do you Need to Thin the Polyurethane before you Spray? Please note for certain product categories particularly filters there is at times an additional charge for shipping. Thinning the epoxy resin using a solvent is very damaging to the strength characteristics of the epoxy. 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. 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. 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. 10.3 When Spraying Polyurethane, can an Airless Sprayer be used? You can thin the polyurethane out the same way you would thin paint out. The finish is a bit too rich to atomize properly. 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. You may also need to add thinne… My Polyurethane Change of Heart. 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 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. 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. When you use the spray polyurethane you do not have to worry about brush strokes or fibers from the brush being in the finish. Apply a very thin coat of polyurethane with a fine brush, foam pad, or cloth. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. Apply the first coat of polyurethane using the best technique for the surface. What can I use to thin the poly to get a good laying finish? 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. Thin it heavily—50 percent or more—so you’re encouraged to apply very thin coats. 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. Spray less accessible areas with aerosol polyurethane. Brush flat surfaces with a thin coat using a bristle brush. What did you spray it with? Or if you can handle it, a CV would be even better. I use a conventional Spartan spray gun, no HVLP or LVLP yet. 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