Homebrew PCBs

In a message dated 2/13/2011 8:37:05 P.M. Central Standard Time,  
cs6061@... writes:

Sealing is not the issue, I want something low cost I can drill  into as 
the bit comes through the board on the back side. Don't want to drill  into my 
vacuum table surface.<<
I always use a layer of old, maybe drilled, "junk" FR-4.  Some may say  
this does not provide proper backing if a HOLE is encountered, but I never 
found  this to be a problem



[Non-text portions of this message have been removed]