I've been using the toner-transfer method with vinyl for some time now, but I'm consistently running into a pitting issue across all of my boards.
On large polygons/planes, and even on fine traces, pits and weathering appear on the surface of the copper. I've added an image in a link below:
https://drive.google.com/file/d/0B4daAsGd6n41aGRRY3QyeVlaS28/edit?usp=sharing
Where the image appears clean, I covered that surface with a sharpie in addition to the toner.
My printer is a Samsung ML-2525. 1200 DPI. (Toner set to transparency and max darkness setting.)
Vinyl is from a local sign retailer.
Currently, I'm not sure if the pitting is from insufficient toner, or from the vinyl, although the vinyl pretty-much always comes out perfectly clean from the transfer.
I picked up some laser foil to try to recoat the board, though I only used it once as I watched it immediately flake off when the pcb entered the etchant bath.
Etchant is cupric chloride.
Thanks for any advice!