Any suggestions, problem with mottling

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  • June 14, 2010 at 5:02 am #21854

    Just got done painting a 2007 malibu front clip bc/cc antique gold. The base had 7 variances with lots of pearl. Normally I don’t have a problem with mottling or zebra stripes with mettalics. The hood shows some slight mottling/zebra stripes. My setup nr 2000 1.3 tip, 29 psi triggered, 14-16″ , wide open fan, 1-1 reduction with ppg dbc and dt 885 reducer shop temp 75, high humidity. Put on 3 coats of base with the last coat at 24psi held farther away for a dropcoat. Also when I did my blend into the doors I hit the hood once again with a 1:1 mixture of reduced dbc base and reduced dbc 500 color blender. Any suggestions what caused this? I am going to have to redo the hood would just sanding the clear and reshooting the base be alright? Any techniques or suggestions when shooting heavy mettalics? Thanks

    June 14, 2010 at 7:59 am #21855

    set the hood up as if it were a blend panel,just 1000 grit it or 800 dry and skuff. since it is already covered, you just have to consentrate on matalic orientation. First I go back to basics, Am I holding the gun correctly in relationship to the panel. Tilting it can cause those stripes. Medium wet, drop coat so the matalic can lay dowm correct, followed by applying the last coat as you said, further away from the panel, lowering the air, and increasing your distance and slowing down, in order to keep from creating dry spray. Reducing the color more can make it a bit easier, just watch the way the paint looks when you apply it on the panel. Once water goes on dry it will not reflow like solvent. I still am not as good as I would expect myself to be, but its all about learning new things. I will sometimes tighten up my fan pattern on my drop coats, just so I KNOW the matalic is not flying all over the place.Hope to help,sorry if this doesn’t. Good Spraying :cheer:

    June 16, 2010 at 10:32 pm #21910

    That is one of the nastiest colors to spray. This is not a cheap fix, but sometimes we need to get another gun. The LHP400LVX by Iwata is a good one for some of those colors that refuse to laydown like you want them to. See if your jobber can get you a loaner gun next time you run into this problem and see if it works for you. The LHP400LVB is another good gun if mottling is a problem. All guns ain’t the same.


    June 16, 2010 at 11:02 pm #21911

    scared to comment here, … but, try opening your spray pattern wide open (as wide as it goes, not till the screw comes out), back up from the panel some,(not sure what your at but) maintain the distance as variations have effect, and go a little slower, with at least, a 50% over lap and change your paint pattern from coat to coat (uneven, too wet and not so wet cause the problem) one word CONSISTANT :unsure: Brads right … tough color :pcorn:

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