Homebrew PCBs

That sounds like an interesting approach to getting a plated through hole.  However, any epoxy smeared on the surface of the board will kill the etching process - you won't be able to etch the base foil.

Otherwise this is what was known as "tent and etch."  Just use a good heavy dry film that will cover and protect the through hole plating. 
  ----- Original Message ----- 
  From: thespeakerguy 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Tuesday, October 19, 2004 2:20 AM
  Subject: [Homebrew_PCBs] An alternative TP hole approach?



  I was wondering if this may ne a reasonable approach:

  1 - Drill the blank copper clad board with slightly oversize holes.

  2 - Squeeege conductive epoxy into the holes. Cure

  3 - re drill the holes to the correct size

  4 - electroplate, photo mask, then etch.

  This assumes a CNC based drill with good repeatability. It could 
  work with LPKF and other grinders, as well as home brews





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