Gentlemen,
I followed this thread for a while. As far as I remember, I didn't see any attempt to transfer the toner to a pre-heated PCB, just applying pressure with a non-thermally conductive flat surface, (i.e. a piece of wood), hence at Amb. Temperature. My rationale is that we're attempting to stick the toner to a moderated hot surface, applying pressure and hotter temperature to the opposite side the transfer should go. In my opinion, this procedure might result adsorption of the toner by the paper, even with a glossy mag cover, second the paper being hotter than the copper substrate, it looks that things are happening preferably within the paper. Should the board be at the right Temp. (TBD), just before toner melting, the toner should be sticking to the copper instead of diffusing into the paper by capillarity.
The second thing I'm bothered by is the use of a Mylar film for retro-projector as transfer medium instead of paper. Combined or not with my first though.
May anybody point me to threads I missed or are simply these two thoughts not tested yet ?
kind regards