These are parameters you should determine by testing.  I am retired now but remember requiring re-priming if >30 hours had elapsed. It is also my memory that poor adhesion results if vapor deposited primer is applied to existing Parylene coating - while acceptable adhesion is obtained when liquid applied primer is applied over existing Parylene.  Again, you should do some testing on your processes to establish acceptable practices.

Good luck,
Mary Davis
Retired Materials and Process Engineer

-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Richard Kraszewski
Sent: Saturday, January 5, 2019 9:15 AM
To: [log in to unmask]
Subject: [TN] Hey Coating Techies

Two parylene coating  related questions regarding primers:

#1 - What is  the maximum time you would allow between priming and depositing  the parylene?

#2 - I have been lead to believe that if you place primer on an already coated parylene surface , the primer will act as a release agent for the next layer of parylene.   Better not to  add primer in this case but rather recoat ASAP.  Would welcome any and all thoughts. 

Thanks in advance 

Rich  Kraszewski 
Senior Staff Process Engineer
Plexus 


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