Thanks Hetal,
the boards are as clean as anything can be after passing our tunnel washer with Vigon 200. The boards are at room temperature when hand sprayed. The spray cans should be among the best on the market. Brian's statement about too much solvent seems to be a hot track. I associate to the spray cans for your car. It's more solvent than paint.
/Inge


  ----- Original Message ----- 
  From: Hetal Shah 
  To: TechNet E-Mail Forum ; Inge 
  Sent: Thursday, August 20, 2009 8:57 PM
  Subject: Re: [TN] Manual spraying


  Hi,
  Sometimes you would lost gloss (get matt finish) if applied the conformal coating on hot board. If you applied the conformal coting on the board at room temp. then it might be another problem of contamination of board. So clean the board  using aerosol cleaner and also use duster which clean properly through holes and the surface of your board.

  Additionally, the spray system is also taking important part for getting uniform coating without bubbling and loosing gloss. If the spray system is not good then it might be chances of air bubbling after curing the board.
  our customer had have same issue and we requested to change the spray equipment and finally he got good result of glossy coating without bubbles.

  Also change and try another types of conformal coating like silicon or acrylic (modified silicon) conformal coating and test your board.

  Hopefully that helps you out.

  Best of Luck
  Hetal


  On Thu, Aug 20, 2009 at 11:17 AM, Inge <[log in to unmask]> wrote:

    Good Evening,
    we use small cans filled with 1B1 conformal coating for handspraying boards. The guys are not satisfied with the result, because sometimes the result is matte. Microscope photos show thousands of microscopic bubbles in the coating. I suspect that it's included driving gas. Or wrong handling the spray can.Anyone out there with experience? How do you avoid this problem?
    /Inge 
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