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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