Homebrew PCBs

I've used similar formula before.  It is chromate based and not environmental friendly. Because of that I started to use dry-film resist. Chromate based resists are proven and you can get very high resolutions. 
Note: Check Message #26532 or search "Photo Resist Gelatin Bicromate Process" in the group archive. 
Volkan 
--- On Mon, 3/7/11, mtuchelt <mtuchelt@...> wrote:

From: mtuchelt <mtuchelt@...>
Subject: [Homebrew_PCBs] Simple Photoresist Recipe?
To: Homebrew_PCBs@yahoogroups.com
Date: Monday, March 7, 2011, 7:38 PM















 
 



  


    
      
      
      Hi All

I posted an interesting patent on a photo resist process. The patent describes applying a non-sensitized (very simple) polymer coating to the pwb, drying and storing. When needed, the board is sensitized by spraying it with the photo-initiator, drying and exposing. 

The developer is water, the stripper is caustic.

Anyone have any experience with or used this ?

Comments from the chemists among us on the usefulness of this info would be much appreciated.





    
     

    
    


 



  











      

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