On 30/09/2015 10:53, 'Dave G4UGM' dave.g4ugm@... [Homebrew_PCBs] wrote:
> When did etch resist pens come in? Pretty sure they were around in 1972.
I vaguely remember using a Decon Dalo pen around then (they are still available), but I could be wrong. I found that cellulose paint made easier to use by mixing it with thinners worked better, and was much cheaper.