Homebrew PCBs

Dear Piers Goodhew 

  see my previous post on Edding pens, they come from fine upwards!

  regards

  Andy
    
  (Apologies if this is a double-mail, my last attempt seems to have
  disappeared)

  I've been meaning to ask re Sharpies: I got one, but the results are not
  great. The first TT project I saw, the author signed the PCB with a Sharpie
  and the result was clearly visible post-etch. But for me, I lose maybe 50%.

  (not that I want to sign my every board, but as a touch up tool, I have to
  cross my fingers)

  Is there a secret with Sharpies (cure time, cure process?) Or is the US
  formulation using chemicals banned elsewhere in the world or something?

  Anyway, the Staedtler sounds rather promising ....

  (re the thickness, mine would be ca. 30 mil. Not thin, but much more
  limiting is my ability to draw accurately, and the tip is round so you're
  never quite sure which part is going to touch down first)

  PG


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