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Antique Tractor Paint and Bodywork

need a sprayer lesson

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gshadel

07-06-2004 10:49:44




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Painting my TO-20. Had some trouble gettting a consistent coating. I have a used sprayer that I picked-up at an auction, never used a sprayer before. Not clear how the 2 adjustment knobs work with each other. One knob appears to be air flow, other knob is paint output. Sprayer says keep pressure below 50 psi, I ran it at 30 psi.
I think I'm looking for better atomization, my first attempt seemed kind-of rough and splattery. What is the best way to do that? More air knob and less paint knob? higher air pressure? Also, I cut the enamel with Naptha according to the directions on the can. Would I get a smoother finish if I added a little more naptha so it would level better?
thanks

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Rod (NH)

07-06-2004 19:54:12




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 Re: need a sprayer lesson in reply to gshadel, 07-06-2004 10:49:44  
I am not sure what gun you are talking about but if it is typical of guns for spraying automotive paints, the upper knob controls the pattern (atomization air) and the lower knob controls the fluid flow through the nozzle. I generally run both of mine nearly wide open all the time. If you are using the correct tip size for the viscosity of material (assuming suction or gravity feed), there really is little need to mess with the fluid knob. Likewise, the air knob controls the pattern and usually you don't mess with that either. Some like to "fine tune" gun adjustments but I have never found the need to do anything along those lines.

You need to be measuring the air pressure right at the inlet to the gun, not at some wall mounted regulator perhaps many feet away. Tee in a pressure gage right where the air hose connects to the gun. You should be able to read the gage to the nearest 2 or 3 psig. If your gun is an HVLP type, the design pressure should be indicated right on the gun itself or the instructions that came with it. It may be anywhere from about 15 psig to 50 psig. If your gun is pre-HVLP, most enamels are best sprayed at 40 - 60 psig. The manufacturer's tech sheet for the paint will indicate the best pressure. Using whatever regulator you have, adjust it while holding the gun trigger open to the appropriate pressure. You don't need any paint in the gun to do this. If you have anything like my arrangement, you'll have perhaps 50 feet of hose between the regulator and gun. There will be a significant difference between the pressure back at the regulator and the pressure "at the gun". It is the pressure "at the gun" that counts.

The "keep pressure below 50 psi" is a little confusing to me. Is it possible that you are using a pressure-fed gun...e.g. the paint cup is under pressure? If so, there should be a separate regulator for the cup pressure, which is usually kept down around 10 or 12 psi, depending on tip size and material viscosity.

It sounds to me like you do not have enough atomizing air pressure. Check it out with the method above.

Since you bought the gun at an auction, you probably don't know its' history. It may need a good cleaning, especially if you are getting spattering. Try completely disassembling it and verify there is no hardened old paint anywhere. Clean all orifices with a toothpick. If it is an old gun, you may have internal leaks where there shouldn't be any. Seals and gaskets may need to be replaced. In any event, check the pressure at the gun first.

Stick with the manufacturer's instructions for mixing. They usually know best about how to use their products.

third party image Rod

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gshadel

07-07-2004 11:16:07




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 Re: Re: need a sprayer lesson in reply to Rod (NH), 07-06-2004 19:54:12  
Rod, thanks for the reply. Based on your thoughts, and what I saw while spraying, it sounds like I need to increase my air pressure some, and maybe do a couple more trials to figure out how much thinner gives me the best spray pattern. I only have the one orfice that came with the gun. thanks again



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Chester

07-07-2004 15:58:38




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 Re: Re: Re: need a sprayer lesson in reply to gshadel, 07-07-2004 11:16:07  
For what it is worth, I have a siphon type spray gun from China and it works best right off my compressor (set at 80#), no regulator. When trying out different guns, I spray water on a vertical section of cardboard. This gives you a good look and feel for what the gun and those adjustments will do. When finished your water spraying, run some methyl hydrate (gasoline antifreeze) through it and some varsol to remove all traces of the water. Most guns have some steel internal parts that will rust severely if you forget that step.

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