A couple of thoughts:
1. Maybe the toner darkener could be sprayed onto copper clad after toner has been transferred to the copper clad. That might work as a substitute for Toner Reactive Foil to seal up the cracks and pinholes in the toner on the board. The toner darkener would have to be solvent only. If there is a residue, it might interfere with etching.Message
Re: Re: [Homebrew_PCBs] tracing paper, laser and photoresist
2013-11-09 by Jan Kok