HELP! – "Fish Eyes" in powder coat

Posted: December 3, 2011 By: MrStop

Home Forums Powder Coating HELP! – "Fish Eyes" in powder coat

Viewing 1 post (of 1 total)
  • Author

    Posts

  • #34062

    MrStop

    Member

    I seem to be getting some “Fish Eyes” in my powder. This has happened two times in a row with slightly different prep process. I am using PBTP Wheel Silver II. This is actually the second time I have coated these wheels in the past couple of weeks. The first time, I didn’t experience the fish eyes. I decided to start over with the wheels due to some flaws and not flowing out well (old powder combined with inexperience).

    First time process:

    • Strip wheel with aircraft stripper
    • Rinse with water
    • Outgass @ 450 for 1 1/2 hrs
    • Sandblast with black diamond (new)
    • Rinse with water and bake at 200 deg for ~ 15 mins to dry
    • Rinse with denatured alcohol
    • Coat
    • Bake @ 400 deg

    I thought that the “fish eyes” may have been from residual stripper or rinsing with water after blasting leaching out. So I modified the process the next time.

    Second time process:

    • Strip wheel with aircraft stripper
    • Wash with diluted Purple Power
    • Rinse with water
    • Outgass @ 450 for 1 1/2 hrs
    • Sandblast with black diamond
    • Rinse with denatured alcohol
    • Coat
    • Bake @ 400 deg

    I had the same “fish eye” result the second time.

    My equipment is an original Hotcoat gun with fluidizer attachment. I am running the air through 2 standard filters, a coalescing filter, a desiccant filter, regulator at gun and gun filter. I can’t imagine at this point I am getting either moisture or oil through the gun. I sprayed air on a white sheet of paper and it is dry an clean.

    [ATTACH]3811[/ATTACH] [ATTACH]3810[/ATTACH]

Viewing 1 post (of 1 total)
  • You must be logged in to reply to this topic.

Top Selling Products

Comments are closed