What air pressure do i use for these paint guns - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-15-2009, 11:12 AM
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What air pressure do i use for these paint guns

I have a siphon feed astro could use for primer
siphon feed craftsman could use for primer
sata jet 90 which is NOT hvlp will use for basecoat/clearcoat

i have a 5 horse puma 2 stage air compressor that will push 120 psi with a sharpe water separator with regulator

sata jet has a regulator with gauge at the base of the gun to adjust there
and is set up with a basecoat clearcoat tip

the other 2 have no regulator at the gun and have a tip set for primer.....should i use a regulator at the gun for them

I have all this stuff and no idea what the air pressures should read for all these items. start with the water separator air pressures and then go to the other 3. thank you for your time

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Old 06-15-2009, 08:33 PM
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You should have a regulator and disposable dryer on all your guns.

You didn’t include the size tank you have on your compressor or cfm rating. The bigger the tank the better. If you have a 60-gallon tank on what you described I would suggest finding another 60-gallon tank to add on. You’d be able to spray much further before the compressor would kick on. Down fall would be the compressor would take longer to fill. With the equipment you described it wouldn’t hurt the machine any. People have done the same with inferior equipment than you have and done alright.

Dupont and PPG have tech sheets that will give you recommended PSI’s for the type gun you’re using. Put a little effort in researching those sites.
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Old 06-15-2009, 11:20 PM
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its a 40 gallon tank and i believe it runs almost 11cfm.
those specs came from puma air compressors site for 2 stage TE50160
http://www.pumaair.com/p65.html

The siphon gun and the sat jet 90 are not hvlp guns. this must mean they will run the same pressures for the same paint used. I just looked at the tech sheet for dplf ppg primer. It says like 55 or 60. So if i have the same tip in all 3 guns i would run 55 or 60 in all 3. I just thought the sata jet was different because it was a more expensive and refined gun.
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Old 06-16-2009, 11:11 AM
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Every gun is different, even with the same size tip.
The number of openings and size in the air cap makes a big difference
in air consumption, (CFM)

The "tip" or nozzle and "needle size"
makes a difference in material consumption.
They're two different things.
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Old 06-16-2009, 12:50 PM
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i was looking in a catalog and it said the astro ran from 50 to 70 psi.

so i have 3 very different guns and dont know enough about the guns i have to figure out what that difference is. All i know about guns is the names of the pieces and i got that from an old manual.

what is normal cfm and how much do i need?
what does cfm do to paint flow?
I really dont know what questions to ask. is there a gun 101
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Old 06-17-2009, 05:27 AM
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Before you paint the car hold the gun and adjust the pressure while holding down the trigger with thinner in the cup and adjust the pressure until you have proper atomisation and the gun doesnt jerk around from the pressure release. As far as gun 101 is concerned try to find a textbook on autobody repair-check local high schools and carer tech schools at the begining of the year because some schools change thier books often and you may be able to get an old book. These can be handy when you have questions about body work and have lots of information about the basics
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Old 06-17-2009, 11:14 AM
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You can vary a few psi to suit your taste but you need a starting point.
Guns vary so much you really need the specs for yours
to know where to start. (70 psi sounds really high to me)
Research the internet to try and find the other guns specs.
Remember, the higher the psi you use, the more cfm you use,
so the compressor has to run more.

Siphon feed (non HVLP) guns can use a lot less air (cfm) than HVLP.
that's one of their advantages.
I could always spray with a lot less psi useing a conventional (siphon) gun,
thus useing a lot less cfm.
That's a major advantage with a small compressor, which most won't
keep up with a HVLP.
I sprayed entire cars with a Binks copy and a 3/4 hp compressor when
I first started. I could spray down as low as 30 psi and it used less than
4 cfm so the compressor was able to keep up.
For small compressors, conventional is the way to go.
Your compressor sounds like it will be able to keep up with most HVLP's.
But if it has to run a lot, you'll have to resolve moisture issues
caused by the hot air from the compressor.
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Old 06-17-2009, 12:51 PM
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how can i resolve the moisture issues. i have had problems with that before in my sand blaster. its kept getting the sand wet and clogging up the gun.

I will look for the specs on all 3 guns, what can i look for in the spray pattern to help me determine the correct pressure
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