[amsat-bb] Off Subject Question

[WILLIAMS MICHAEL <k9qho6762@xxxxxxxxxxxxx>]

I'm getting ready to etch a two sided PCB for a satellite related homebrew project. The bottom side is the ground plane which I don't want etched.
   
  What is the easy way to protect it from the etching solution?
   
  Electrical tape?
  Masking Tape?
  Sharpie Pen?
   
  Thanks
   
  Mike
  K9QHO
  AMSAT 33589
   
   
   
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