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Antique Tractor Paint and Bodywork

Low Pressure High Volume Spray Gun

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Bill from Scotl

09-26-2007 15:35:32




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Hi Guys
I bought a spray gun kit when visiting the US,while on vacation. This was mainly for the airbrush and a small touch up gun. Along with this however came a bigger gun which I havent got around to using as yet. How can I tell if it is just a regular spray gun or a low pressure high volume version? What are the advantages of each. Which one will use the least air to drive it. I have a 14cfm compresser.
Thanks in advance.
Bill

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Johnsdeere

10-18-2007 14:48:50




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 Re: Low Pressure High Volume Spray Gun in reply to Bill from Scotland, 09-26-2007 15:35:32  
Most people dont have enough CFM for HVLP guns, you need aprox 1 Hp for every 4 CFM min, plus larger air lines and hoses. Your fittings should be high air flow fittings not the normal fittings either, HVLP is not recommended for most shops because of this. Yes they are great gun style though. Just remember you get what you pay for. A $99 spray gun kit is not going to be as nice as a $600 SATA.

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Kent in KC

09-27-2007 07:50:49




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 Re: Low Pressure High Volume Spray Gun in reply to Bill from Scotland, 09-26-2007 15:35:32  
I like my HVLP, not just for the minimal overspray, but I think it gives me finer control. It may not be a fast as a high pressure gun but I have yet to cause a 'run' or sag.

I just painted a car in my attached garage and did not coat my shop with overspray. Just a little on the floor.



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CNKS

09-26-2007 17:24:02




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 Re: Low Pressure High Volume Spray Gun in reply to Bill from Scotland, 09-26-2007 15:35:32  
With 14 cfm (at 100 psi) there is no problem. Usually HVLP is gravity feed, the cup is on top of the gun. Will also have the recommended pressure marked on it somewhere. That can vary from less than 30 to 50 psi, depending on the gun. Regardless of the low pressure, HVLP uses the most air. Advantage is that there is less overspray as the tip pressure is reduced internally to about 10 psi. Disadvantage is that if you are used to conventional guns, HVLP is slow, at least until you get used to it. I like them, but I have not used conventional in years, and not much then.

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