But there are many variables manufacturers can’t take into account, including the actual stain or finish you’re spraying, how much thinner you’ve added, the length of your air hose, and temperature variations (liquids become thicker in cooler temperatures and require more pressure to atomize). Apply clear coats and acrylic enamels in two full wet coats as medium wet coats do not contain enough amount of material for optimum flow-out and may give you orange peel effect as well. However, you do not need such kind of expenditure and neither do you need any suggested setting by the manufacturers. It is highly recommended that the pressure setting should be as low as possible for best results. On the other hand, for urethanes and epoxies, the 1.3 or 1.4 will work fine. Setting the air pressure to about 28-29 PSI for clear will ensure you having great flow out. Open the drain valve and wait until the pressure level drops down, until its low enough to start the compressor. This article originally appeared in the November 2008 issue. From this setting, reduce a little too extreme environment or a bit further. Clockwise to increase and count-clockwise is used to decrease the maximum pressure settings. For an HVLP gun, you need the smallest fluid tip that will still let you PSPC the required area and keep that particular area wet for long enough to get adjacent areas painted with the same thickness of the coating. Turn it clockwise to increase the cut-in pressure. Separate cup pressure regulators are also available for increasing the rate of application with heavy-bodied materials. If you run your spray gun off a compressor, you know you have an infinite range of pressure you can use. Continue increasing the pressure by 5 or 10 psi and test spray on the cardboard until you get your desired spray pressure ideal to serve your need. Adjust the cut-in pressure you just jotted down, with a big sheet screw. It is imperative that the whole time, you are holding the gun at the same distance from the cardboard. Adjust the cut-in pressure you just jotted down, with a big sheet screw. They are the points at which the compressor starts and stops. Most of the tech sheets provided with the product feature suggestions for the optimum fluid tip size. Low Volume Low Pressure Spray Gun (LVLP) Air Pressure Setting. The only glitch they might face is condensation. The easy way to do this is to open your hand fully, placing the tip of your little finger against the target and the tip of your thumb against the air cap on the gun. You’ll get a relatively narrow width pattern with noticeably large dots around the edges. If you change to a different finish material, or if you thin it differently, or if the temperature changes (for example, if you keep your shop cooler at night, the finish will be thicker first thing in the morning), you’ll need to perform the test again to find the optimum pressure. For non-HVLP guns, that pressure is usually between 40 and 60 psig. You have to be careful in setting the pressure of the sprayer just right. Use viscosity cup whenever required. Now test spray on a piece of cardboard or brown paper. Then spray a short burst onto brown paper or cardboard. It is best to keep the cut-in pressure at 6.1 bar at the minimum, which means the cut-out pressure will be 7.1 bar. HVLP gun main feed is a high volume of air to function. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. This implies that cut-in is lower than the cut-out pressure. (The finish shows up better on a brown surface than on white paper.) Continue increasing the air pressure in increments of 5 or 10 psi and spraying short bursts. Increase the air pressure by 5 or 10 psi and spray another burst. Pressure is setting fares high in perfect finish using both small and large industrial compressors as they are most fundamental and vital setting. GoPaintSprayer.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Make sure you have at least two water filters; one 10-15 feet from your tank and the other one at your gun neck to keep the water out of your lines. At cut out pressure, the compressor will stay and will start again once the pressure drops to the cut-in pressure level. So reduce the air pressure to the previous setting or maybe a little further, to just before the pattern starts shrinking and the dots start becoming larger. Low Pressure relates to the actual air cap where the air and paint come out. Most HVLP spray guns will use up 10-14 scfm (air volume) at 40 psi. These results shared here are obtained using Mattson 5050 Filter Regulator, 2 Milton Quick Connect Couplers and 30 feet of 3/8″ ID B.F. Goodrich hose. It is preferred by many as it provides much better results as compared to using a brush because it gives much smoother finish and takes less time. The right amount of pressure setting is going to get perfect results you are looking for.
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