I threw this question out once before but I still cannot determine the 
     source of bubbles in our conformal coating process.  We are using an 
     acrylic coating and a Nordson Select Coat System.   The bubbles come 
     and go from day to day.  
     
     We have looked at viscosity, temperature, humidity, pressure, 
     z-height, contamination, micro-adjust, and a few other variables. Has 
     anyone else seen this phenomenon or do you have any insight on it?  
     
     Any help is very much appreciated.
     
     Thank you.  

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