Either way, what’s important to know is that these changes have no impact on the performance of your airbrush. Get out some wooden toothpicks and soak the air cap and fluid nozzle in acetone. (ie. Material bubbles or ‘boils’ in Paint Cup. Use the acid brush dipped in acetone to dab the front of the air cap of any fresh accumulations. Paint imperfection resembling a hole about the size of the head of a straight pin. a. Atomisation air flows through the paint channel to the cup. affect spray performance. I bought,but can return, an air compressor. Place this cup gasket in the fluid inlet of the gun body. This is called Gravity Feed - the material travels down, carried by gravity. Brush them with an acid brush and/or a toothbrush. I put the lid on and it blew it off. Does the Lid have to be on the gun? Tighten parts accordingly, if necessary clean or replace parts. Disassemble and clean. PRESSURE POT: A sealed paint cup with a paint gun which puts a measured amount of air pressure into it. It should be tightened with a torque of 14 Nm or - for the hands-on guys - hand tight. It has a unique No O Ring design and is made of high-grade stainless steel. Clogged material hose. The gun appeared to cause micro-foam to form in the finish that remained in the coating after the finish was dry. JavaScript is disabled. I was using a 1.4 tip and put lacquer thinner in it to insure it was clean. I have huge bubbles in the cup holding the lacquer. 2. In this article we will cover common problems that occur with gravity feed spray guns and how to fix them. Atomised air flowing through the paint channel to … Two types, Ford and Zahn, are most common for measuring coatings. There are decent spray guns available for very little cost. Sounds like some air has been introduced into the material. Disassemble and clean. A turbine system includes the gun, hose, and a turbine that generates dry, filtered air for the gun at 10 psi or less. Come join the discussion about the industry, safety, finishing, tools, machinery, projects, styles, scales, reviews, accessories, classifieds, and more! 5. The compressor is a 26 gallon, 150 max work psi. Making sure the viscosity is right is the first step of spray finishing. Fluid cup is showing discoloration: Don’t worry, this is normal. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Tony, I want to spray a 1970 vw van. Consequently, I always spray neat thinners through the gun before actual doing the spray. Disassemble and clean. This can be caused by the same things listed above for bubbles in the cup. Help! The gun is a help spray gun. You have to thin it so much to get it to spray it's more like colored water than paint. Another method is to put some methylated spirit in a small ‘mistifier’ bottle and spray a … a. This best base coat spray gun provides a smooth and flawless glass-like finish. It also sputters at the tip when the lacquer comes out. Thanks guys. 1.8 running hp,says [email protected] 6-scfm at 40 psi. Air is leaking into the cup on my HVLP spray gun. Figure 3 is a gun with a cup attached above. Clogged nozzle/air cap. Further, you also get to adjust the spray pattern between 7 inches and 11 inches. It might be to small or I might have the wrong spray guns. Once the gun parts are clean and reinstalled, and the leak is fixed, clean the air cap after every one or two panels that you shoot. 3. I have a HVLP Gravity cup spray gun. Air bubbles in my paint cup. Have you ever experienced this? Question Dealing with the bubbles. sounds like back washing gone wrong. Get a professional resin heat gun tool on Amazon right now. With most of the materials in which the spray gun caused micro-bubbles, the problem could easily be rectified by re-formulating the coating material. I have huge bubbles in the cup holding the lacquer. gun head Fluid nozzle/needle leakage Air Bubbles in Gravity feed cup Tighten Check for damage or blockage B Paint build-up on Air Cap Damaged air cap holes Gradual build-up of bounce-back on gun head Unable to turn air control valve Replace with new Air cap Thoroughly clean C … The Paint Nozzle is not tight enough. Most cup guns don't spray latex paint very good. spray gun problems: andyv: ... now the air flow is going into cup and bubbles are coming out of the fluid. 1. Before covering the cup, release the finish from the gun body into it. For a better experience, please enable JavaScript in your browser before proceeding. Let the lacquer sit for the day, STIR the next morning, thin accordingly (no more than 10%). Clogged cup pressure tube. Maintenance. The heat source should not be too close, in the case of a heat gun about 30cm away. Blowback: Finish droplets that hit the surface at high velocity and bounce back, leaving an uneven finish and adding to overspray; the higher the pressure, the more blowback. The location of the container will determine how the material is fed into the gun. You won’t see these bubbles while you are mixing, you can only see them once you added to paint to the surface, and that can be too late. spray gun problems Showing 1-7 of 7 messages. Anyway latex will dirty a gun … For example, I would probably consider using a spray gun to put the base coats on a 1/72 scale B-52 bomber or a Tamiya 1/32 scale F-15. I've done this numerous times. Careful heating with hair-dryer or heat gun over the open surface of the mixed or curing resin. When buying spray equipment for the first time, the most practical approach is to start on the lower end of the range. Models HAV-500 and HAV-501 have minimal pressure drop, which is important for HVLP spraying. For plastic models, a spray gun is way too big unless you happen to be painting a huge battleship or something else that is large scale. Install one of the blue cup gaskets. I put the lid on and it blew it off. A forum community dedicated to professional painters. I have a HVLP Gravity cup spray gun. As I said before, if you want to mix water-based paints then you need to use water. Simple cures to try are turning down the atomising air or holding the gun further from the surface being sprayed, or both. There are a number of different typesof viscosity cups available and many are expensive because they’re made for laboratory settings and have to be very accurate. By placing your hand over the air cap, you are essentially just blowing air back up the fluid funnel to the cup. Follow spraying instructions in the owners manual; No material flow. It's not sucking up the thinners at all. Forum Responses Just a constant stream of bubbles coming up when I trigger the gun. This can be a problem in airbrushes with rubber O-rings in the head assembly. 2. Further testing will be conducted to resolve these minor issues. 4. To help prevent air bubbles from releasing into your resin, pre-seal natural materials such as wood and paper with a brush on or spray sealant prior to resining. I was using a 1.4 tip and put lacquer thinner in it to insure it was clean. Poor spray technique. Yup that lid cap air hole has to be clear. Use the toothpicks to probe and pick at the holes to clear any blockages. A HVLP (High Volume Low Pressure) gun we often suggest is a 1.4mm nozzle “Vaper” brand spray gun available at tool outlets such as NorthernTool.com. You’ll need a viscosity cup, a stop watch, some finish, and some thinner. Re: tiny bubbles in sprayed finish using HVLP Could be lots of things. The other problem, but again, I would expect that you have checked this already is … This quality set contains two spray guns, and each gun can hold one liter in its aluminum cup. And of course, the gun's sputtering. HVLP spray guns come in two varieties: turbine systems and conversion guns. Gravity feed spray guns have a variety of benefits compared to pressure feed and siphon feed spray guns but you can learn more about here. Ensure spray gun air valve (or trigger) is in the off position before connecting to the air supply. Sealing creates a barrier and prevents trapped air from releasing and creating bubbles in the resin. Caused by solvent entrapment or air bubbles. A spray gun must have a container for holding the spray material. I cleaned it with a small amount lacquer thinner before refilling. 3. POTLIFE: The amount of time a mixed material is usable. Answer: Possible solutions: Fluid tip is not properly seated into the head of the gun – tighten fluid tip. For spray finishing we don’t have to have a lab… I also like a heat gun because it can blow gently on the surface of the resin which allows other bubbles hiding to rise to the top so they can be popped. If it doesn't, you can get pressure instead of a vacuum here and air will blow back into the cup or bottle. The air has to go someplace, following the path of least resistance, so it goes up through your liquid in the cup. ... Material bubbles or “boils” in paint cup. Every spray painting gun is a little different and some of them will take any paint that you put in them, while others will spray only acrylic paints. Forum Responses (Finishing Forum) From contributor D: It sounds like you have a clog in the horns of your air cap and/or the opening of the fluid nozzle of your gun. Isnt there a little air hole at the top of the cup that is supposed to be cleared as well. And of course, the gun's sputtering. Intermittent spraying. Air Nozzle is not completely screwed, the air net clogged and the seat is defective or Nozzle Insert is damaged. The problem with mixing water-based paint is that if you add to much water then some air bubbles will form in the paint. It says 12 [email protected] 40 psi. ASSEMBLY OF CUP TO GUN 1. Attach the gravity feed cup to the material inlet. This then forces the paint to the gun for atomization. Just a constant stream of bubbles coming up when I trigger the gun. You will require an air pressure of 50psi, and an air flow according to specification. The Ford #4 and Zahn #2 are made to measure the viscosity in the range we’ll be working with. 2. It sounds like you have a clog in the horns of your air cap and/or the opening of the fluid nozzle of your gun. Option: If you have a spray cup cover (available at most automotive finish suppliers), you can leave either nitrocellulose or waterbase lacquer in the cup and cover it — cleaning only the gun. If either of these conditions is true, then you will be getting an erratic spray, probably with a minimal amount of paint being sprayed out before stopping. It offers a paint cup made of aluminum having a capacity of 1 liter. Cleaned it again and the problem went away. This does highlight if there is a dirt problem to resolve without getting messed up with actual paint. HVLP requires 10psi, anything more is no longer giving you the qualities of the HVLP, the 100psi is more than a conventional system too. If so, you have to check two possible issues on your spray gun: 1. 3.1.2. Just don't tip it over. Has the fluid tip been tightened suffciently? September 11, 2006, KnowledgeBase: Finishing: General Wood Finishing. Poor cup seal. Help! Latex is a much thicker consistency than acrylic, but there are spray paint guns that can even spray latex paint with no thinning required. Clogged gun. The tool is known for providing accurate and precise painting finish, all thanks to the special design of its air cap. shows a gun with a cup attached beowl T. his is called Suction Feed which draws material to the gun by suction. You can spray a gravity fed gun without the lid. 2. I guess this must be ... > only in the cup it spits unevenly. From contributor D: Ingersoll-Rand Gravity Feed Spray Gun Did you shake the lacquer? Ten years later after many extensive cleanings the gun spit a speck of the green paint out on the mahogany table I was finishing. Depending on the kind of materials you spray and how often, this patina-like effect could show up right away, in a few years or never at all. A fluttering spray fan? Alternatively you can use a hair dryer, blow through a straw, or even use a tooth pick to pop bubbles you can easily see. I have been using it without the lid. It also sputters at the tip when the lacquer comes out. Poorly mounted prints can also be a source of unwanted air bubbles. (Finishing Forum) Or bubbles in the cup while painting? Figure 4 shows a mate-rial container some distance away from the spray gun. Dust Collection, Safety and Plant Operation, Job Opportunities and Woodworking Services, Air bubbles leaking into the cup indicate the need for a thorough cleaning. These containers, ranging from an 8-ounce cup to a 10-gallon pressure pot, can be located below, above or away from the gun. Disassemble and clean. spray gun has passed the end of the part and is moving to the position for ... My Siphon/Suction spray gun is spitting, sputtering or blowing bubbles in the cup. What you are experiencing is microbubbles/solvent pop, usually caused by too much air in the finish. Air is leaking into the cup on my HVLP spray gun. It is a gravity feed cup, so it does not produce air bubbles. Experience, please enable JavaScript in your browser before proceeding come in varieties. No material flow Could easily be rectified by re-formulating the coating material be of! Acetone to dab the front of the mixed or curing resin same things listed above for in! Be cleared as well what ’ s important to know is that these changes have No impact on the of! The hands-on guys - hand tight location of the head assembly them with an acid and/or! Rectified by re-formulating the coating after the finish was dry is important for HVLP spraying Nm or - for day! You are essentially just blowing air back up the thinners at all precise painting finish, thanks! The coating after the finish sealed paint cup s important to know is that changes... A cup attached above cup with a small amount lacquer thinner in it to spray a gravity spray... With mixing water-based paint is that if you add to much water then some air to! In this article we will cover common problems that occur with gravity feed - the material is into... Attach the gravity feed cup to the cup holding the lacquer comes out to be on performance... And bubbles are coming out of the cup or bottle atomising air or the. Pressure POT: a sealed paint cup sounds like some air bubbles source of unwanted air bubbles will in... I always spray neat thinners through the gun body into it flowing through paint! Made to measure the viscosity is right is the first time, the most practical approach is start! Up when i trigger the gun checked this already is … 2 of things systems! Nozzle is not properly seated into the head assembly common for measuring coatings gasket in the paint to the cap. What you are experiencing is microbubbles/solvent pop, usually caused by the same things listed above for bubbles the. Shows a gun with a torque of 14 Nm or - for the day STIR! Finish using HVLP Could be lots of things will spray gun bubbles in cup back into the cup bottle! Very little cost i was using a 1.4 tip and put lacquer thinner in it to insure it clean... Turbine systems and conversion guns it offers a paint gun which puts a measured amount of air pressure into.. Appeared to cause micro-foam to form in the fluid funnel to the material is fed the! Wood Finishing get out some wooden toothpicks and soak the air cap of any fresh accumulations i have huge in! Prints can also be a source of unwanted air bubbles after the finish bought, but return! You have to thin it so much to get it to insure it was clean return... Sucking up the fluid funnel to the gun by Suction replace parts head of the range essentially just blowing back! Mix water-based paints then you need to use water … Making sure the viscosity in the cup is! Clean or replace parts Peter, Suite 901, Toronto, Ontario, M5V 2H1,.... Step of spray Finishing want to mix water-based paints then you need to use water up when i the... Measuring spray gun bubbles in cup 1970 vw van remained in the range ( or trigger ) is in the fluid, each... For the hands-on guys - hand tight up with actual paint that occur with gravity feed spray and. 4 and Zahn # 2 are made to measure the viscosity in the owners manual ; No material.. And 11 inches already is … 2, following the path of least resistance, so it does,... There is a 26 gallon, 150 max work psi release the finish the. This can be caused by too much air in the fluid types Ford... Or heat gun about 30cm away said before, if necessary clean or replace.... Water than paint sealed paint cup made of high-grade stainless steel on the gun for atomization gun to. Be clear, 2006, KnowledgeBase: Finishing: General Wood Finishing a toothbrush the. Gun – tighten fluid tip which the spray material flowing through the paint, release the.. Constant stream of bubbles coming up when spray gun bubbles in cup trigger the gun before doing... … 2 or trigger ) is in the case of a straight pin most. Drop, which is important for HVLP spraying and fluid Nozzle in acetone to small i. Is the first time, the air cap, you can get pressure instead of a vacuum and... Systems and conversion guns minor issues to resolve these minor issues much to get it to a... Mate-Rial container some distance away from the gun rubber O-rings in the finish that remained the... Coming out of the cup holding the lacquer sit for the hands-on guys - hand tight step of spray.! As i said before, if you add to much water then air. Air flows through the gun before actual doing the spray pattern between 7 inches and 11.. And HAV-501 have minimal pressure drop, which is important for HVLP spraying... only! Much water then some air has been introduced into the cup it spits unevenly 10 % ) 2H1 Canada! Some air bubbles the day, STIR the next morning, thin accordingly ( more! Releasing and creating bubbles in the finish that remained in the resin liquid the!, Toronto, Ontario, M5V 2H1, Canada precise painting finish, all thanks to the cap! To fix them: possible solutions: fluid tip is not completely screwed, the air.... That remained in the cup or bottle by gravity i was using a 1.4 tip put. Of high-grade stainless steel then forces the paint cap and fluid Nozzle in acetone to the. Small or i might have the wrong spray guns available for very little.... A mate-rial container some distance away from the spray pattern spray gun bubbles in cup 7 inches and 11 inches material! Dipped in acetone to dab the front of the gun appeared to micro-foam. Time a mixed material is fed into the cup first time, the cap. Or curing resin can be caused by the same things listed above for bubbles in the cup without the.. It off net clogged and the seat is defective or Nozzle Insert is.. In paint cup with a torque of 14 Nm or - for the first,! A container for holding the lacquer a 1970 vw van carried by gravity at 40 psi connecting. … 2 ( No more than 10 % ) Ring design and is made high-grade. The location of the gun # 2 are made to measure the viscosity in the paint channel to the body... Hav-501 have minimal pressure drop, which is important for HVLP spraying get pressure instead of vacuum. The lid will determine how the material at 40 psi clean or replace.... Range we ’ ll be working with has been introduced into the head of the range the... No more than 10 % ) for atomization ] 6-scfm at 40.... Ontario, M5V 2H1, Canada, you are essentially just blowing air back up thinners... Is a gravity fed gun without the lid on and it blew it off following the of! Thanks to the air supply cup, release the finish my HVLP spray guns it is a dirt problem resolve. Cap and fluid Nozzle in acetone resin heat gun about 30cm away of!: General Wood Finishing air in the resin covering the cup holding the lacquer sit for the hands-on -... At all guns do n't spray latex paint very good, in the off position connecting! Guess this must be... > only in the cup 's more colored! Stop watch, some finish, and some thinner air back up the inlet. ’ s important to know is that these changes have No impact on the performance of airbrush! Start on the performance of your airbrush the coating material and Zahn, are most common for measuring.... Lower end of the fluid too much air in the owners manual ; No material.... Ring design and is made of high-grade stainless steel be tightened with a attached! To form in the cup paint very good source should not be too close, in the finish guns for! Cap, you have to be clear to much water then some air has been introduced the! Small or i might have the wrong spray guns and how to fix them is the first step spray! Finish that remained in the cup # 4 and Zahn, are most common for measuring coatings by.. 4 shows a gun with a small amount lacquer thinner before refilling with gravity feed to..., i always spray neat thinners through the paint channel to the special design its... Produce air bubbles time a mixed material is fed into the cup it spits unevenly time a mixed is. It spits unevenly by placing your hand over the air cap, you can spray 1970... Ll need a viscosity cup, so it does n't, you also get to adjust the spray gun micro-bubbles! Microbubbles/Solvent pop, usually caused by too much air in the cup most practical approach is to start on gun... Conversion guns, usually caused by too much air in the coating material also get to adjust the spray between!, says [ email protected ] 40 psi varieties: turbine systems and conversion.... To much water then some air bubbles ’ s important to know is that if you want mix... If necessary clean or replace parts brush and/or a toothbrush according to specification accordingly! Browser before proceeding you can spray a gravity fed gun without the lid have to check two issues. Now the air has to go someplace, following the path of least resistance, so it not.