Homebrew PCBs

Hi Donald,

You wrote, I think of the glue I am using:

> I'm quite sure it is gum arabic
> http://en.wikipedia.org/wiki/Gum_arabic, which is a very common paper
> adhesive where toxicity might be an issue (stamps, envelopes, ...)
> Readily dissolves in water; stable; long-lived.

This liquid has no colour.  When dried it turns into a firm, clear,
plastic-material which is uncoloured (except for browning in the oven at
200C).  That material can be softened and probably dissolved in water.

The MSDS indicates it is 10 to 15% Poly Vinyl Alcohol - and I can't
think of any reason to dispute this.  My initial tests indicate it is
good for laser transfer paper.

  - Robin    http://www.firstpr.com.au/pcb-diy/