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Old 03-07-2003, 08:29 AM
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Post PSI at the gun?

Did some searching on the site and found some stuff but different recommendations. What PSI should be at the compressor and what PSI should be at gun for primer, base, and clear? I have heard 35 and 60. Any thoughts or does it depend mostly on the gun and how I feel? What would be a good starting point?

Here are the two posts that I read just so you guys know I did my homework first.

You guys rock. Thanks for the help.

http://www.hotrodders.com/cgibin/ubb/ultimatebb.cgi?ubb=get_topic&f=13&t=000891

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Old 03-07-2003, 01:32 PM
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It all depends on the gun your using and what tip your using in it. HVLP gun require less pressure than regular guns. Some HVLP guns take air pressure down to 25 PSI to work. What kind of gun and material are you working with?

HK
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Old 03-07-2003, 06:39 PM
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If your using an hvlp gun, the most pressure you want is 43 psi at the gun. Comes out to about 7 or 8 at the tip. Anything more than that and your hvlp is no longer an hvlp. It is too much pressure for those guns also. Not good for the seals.
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Old 03-10-2003, 03:55 AM
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First thanks for the replies. I am using a SATA and spraying (and I know I might catch some grief for this) a plastic promoter, primer surfacer, base, and clear. The tip is a 1.4. It kind of seems that everyone has some different answers at what it should be. The gun I have is brand new (first time spraying). What is a good way to test to make sure the gun is laying down the material correctly? Thanks again.
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Old 03-15-2003, 04:26 AM
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hey a mate that tought me to paint works for Ford as head painter they way ive been shown is 25-40 primers and 35-60 basecoats and clears it all depends on weather its enamel acrylic or two pac good luck
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Old 03-17-2003, 03:59 AM
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Hey 390. You were about right. The primer surfacer is lower than the bases and clears. Did my plastic adhesion promoter and primer surfacer too. The plastic adhesion promoter went on a bit heavy but was due to me not knowing the gun setup too well. Got a run but got it out with some masking tape. The primer surfacer went on well once I adjusted the PSI at the gun. But I used about 30PSI for primer surfacer and a little higher (35PSI or so) for the adhesion promoter. This was always around 3-4 psi at the gun. Worked well for doing light coats. Hope this helps someone else.
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