Hi,

 

  I have been playing with some conformal coating material and I have a
couple of general questions.

 

1.	Coatings get VERY thin around sharp corners. Using a number of coats
seems like the only way to build up any serious thickness.


2.	Potting seems like another name for "Very Thick Conformal Coating". 



 I am looking as an application where a sensitive electronic module will be
placed in a wet humid environment. It is a sensor going into the cooling
tower of a HVAC system.

 

  After reading about conformal coating and playing with some sprays and
brush on material I think thick potting is the only option to keep moisture
out of circuits. We need at least 20 Meg ohm between circuits spaced 10 mils
on FR4 material.

 

 Can anyone verify I am on the correct track and can they point me towards
selecting the proper materials and process?

 

Thanks,

Bob Kondner


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