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Thread: Spray gun set up problems

  1. #1
    Join Date
    Jul 2013
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    Spray gun set up problems

    Hi every one,

    Today i set up my spray gun to etch prime the panels on the series 2 land rover I'm restoring.

    the gun set up is as follows,

    1- Air pressure at gun is 30psi (i have a reg at the hand piece set at 30psi)
    2- Reg on compressor is at 60psi ( i am allowing for pressure drop over the 15m of air line)
    3-F an control set to hand span width at a hand span distance from panel
    4- Fluid control set at 2 and half turns out from closed
    5- Weather temp wise is 30-33 degrees C

    i have set up a 3 x 3m gazebo with tarp walls as my make shift spray booth.

    When i spray at these settings i am getting a rough sand like finish on the panel and a web like spray floating around.

    what am i doing wrong with the set up??

    Cheers for your help and time
    Josh

  2. #2
    Join Date
    Dec 2012
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    Inverell nsw
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    You may need to put some thinners in the etch primer to make it flow better. What sort of etch primer are you using.

  3. #3
    Join Date
    Jan 1970
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    spray painting

    Hello Josh,I'am no expert on spray painting,but I think you may find that you are not adding enough thinner to your etch primer and it is virtually flash drying as soon as it hits the metal surface.Etch and undercoats dry very quickly and need to be thinned out on hot days,also make sure your metal panels are not heated by the sun before you spray.Hope this helps

  4. #4
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    Thanks guys
    I have attached a photo of the etch primer I am using
    Attached Images Attached Images

  5. #5
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    Are you sure your compressor produces enough flow? The hvlp guns need 10 cfm.

  6. #6
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    Dec 2012
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    Inverell nsw
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    SII Josh I use that every day at work. Thin to about 20 to 25 % with a good quality GP thinner . Give 2 coats for a good coverage . Bumper

  7. #7
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    cheers bumper,

    are my settings in the ball park??

  8. #8
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    Dec 2012
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    you could narrow the fan a bit but the rest look ok spray a bit on a board or an old drum before you try it on job have a play with the needle screw it may need a few turns out . use a good respirator or it will give your throat curry..
    Bumper

  9. #9
    Join Date
    Jul 2013
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    Found the sore throat out the hard way, got a good double filter respirator now

  10. #10
    Join Date
    Feb 2013
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    Ballarat,Vic,Aus
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    Have a look at the paints specs, it may require a much bigger needle than your using. Your also battling high heat. You have it backwards, I struggled for ages painting a metalic car in 30+degree temps .... You need to thin the paint LESS, I was thinning it more. You see the more you thin the paint, the quicker the thinner evaporates. Thin it a lot less and it'll stay wet as it hits the panel allowing you to still have a wet edge to lay the next stroke over.

    Also pull the top reseviour off the gun and make sure there isn't a filter in there (they restrict flow to much IMO) and check breather on the guns lid. If the breather is blocked you'll have all sorts of issues and *nothing* you try will fix it.

    seeya,
    Shane L.

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