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Any ideas on what causes this? (pockmarks in the powder coat)

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  • Any ideas on what causes this? (pockmarks in the powder coat)

    Any ideas on what causes this?

    The grill originally had several coats of latex paint on it. It was sandblasted to bare metal, out gassed for one hour at 400 degrees, dipped into a five gallon can of thinner, hung to dry, blown off and brushed off of any remaining sand, powder coated with a Red Line Alpha gun at 75,000 volts, put in an oven and heated to 350 degrees as indicated on the powder and held there for 10 minutes as indicated on the powder.

    Parts of it came out perfect and parts of it have these pockmarks in it. Why?
    Attached Files
    Last edited by autoshopowner; 11-02-2007, 03:37 PM.
    Glenn R. Lever
    Rochester, New York 14617-2012
    My Cars http://www.leverfamilysite.com/vehicles.htm
    Control arm Info http://www.leverfamilysite.com/GM_A_body.htm

    Join us July 6-8, 2007 for the 5th Annual Northern Chevelle Gathering, Niagara Falls, NY!!!

  • #2
    Re: Any ideas on what causes this? (pockmarks in the powder coat)

    overbuild .
    too much powder on some areas

    Comment


    • #3
      Re: Any ideas on what causes this? (pockmarks in the powder coat)

      So the area with the pockmarks has to much powder on it?
      Glenn R. Lever
      Rochester, New York 14617-2012
      My Cars http://www.leverfamilysite.com/vehicles.htm
      Control arm Info http://www.leverfamilysite.com/GM_A_body.htm

      Join us July 6-8, 2007 for the 5th Annual Northern Chevelle Gathering, Niagara Falls, NY!!!

      Comment


      • #4
        Re: Any ideas on what causes this? (pockmarks in the powder coat)

        yes, it looks like it ,
        it might have happend when coating the fins
        at 75kv it might be too much kv for reaching inside the fins so that means you'll drop more powder trying to reach the insides and therefor overbuild on the outside or around the area you where trying to reach.

        Comment


        • #5
          Re: Any ideas on what causes this? (pockmarks in the powder coat)

          Thanks. I will try that.
          Glenn R. Lever
          Rochester, New York 14617-2012
          My Cars http://www.leverfamilysite.com/vehicles.htm
          Control arm Info http://www.leverfamilysite.com/GM_A_body.htm

          Join us July 6-8, 2007 for the 5th Annual Northern Chevelle Gathering, Niagara Falls, NY!!!

          Comment


          • #6
            Re: Any ideas on what causes this? (pockmarks in the powder coat)

            autoshopowner,

            You say you dumped it in a 5 gal can of thinner. If so the thinner may have contaminated it. Try using Acetone or Alcohol to clean.

            John

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            • #7
              Re: Any ideas on what causes this? (pockmarks in the powder coat)

              I'm with jrow, loose the thinner. Nothing petroleum based.

              Comment


              • #8
                Re: Any ideas on what causes this? (pockmarks in the powder coat)

                I have never had any problems with the thinner leaving a residue. What would you use?
                Glenn R. Lever
                Rochester, New York 14617-2012
                My Cars http://www.leverfamilysite.com/vehicles.htm
                Control arm Info http://www.leverfamilysite.com/GM_A_body.htm

                Join us July 6-8, 2007 for the 5th Annual Northern Chevelle Gathering, Niagara Falls, NY!!!

                Comment


                • #9
                  Re: Any ideas on what causes this? (pockmarks in the powder coat)

                  Originally posted by autoshopowner View Post
                  I have never had any problems with the thinner leaving a residue. What would you use?
                  Most any pre-paint cleaner should be o.k. I use Acetone and some like to use rubbing alcohol.

                  Comment


                  • #10
                    Re: Any ideas on what causes this? (pockmarks in the powder coat)

                    I'm going with powder build up. If you were to sand out the pocks and reapply a light coat and fire it, I believe it would fix it. How many people do this?

                    Comment

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