Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Just getting started with the toner transfer method.  I found what I consider to be a great transfer paper:
http://www.ebay.com/itm/A4-10Pcs-Sheets-Heat-Toner-Transfer-Paper-For-DIY-PCB-Electronic-Prototype-Mak-/170900415631?pt=LH_DefaultDomain_0&hash=item27ca75648f
for $1.96/10 sheets, delivered. Prints nicely, perfect release, no soaking at all.

On to the problem:  I'm using an HP printer with an aftermarket toner.  It prints nicely onto the transfer paper, and transfers nicely to the PCB (using a GBC laminator, multiple passes).  Appeared to etch nicely (ferric chloride, for now, since I had some on hand), but I didn't have acetone ready to clean the toner off the etched board.  Three or four days later, acetone in hand, I cleaned the traces, and found numerous pinholes on all the traces.  I'm speculating that the toner absorbed minute quantities of etchant, and continued to etch until wiped clean.  Is this a reasonable assumption - that cleaning immediately after etching is required?  Or is the aftermarket toner suspect??

Any thoughts would be appreciated.

Norm
W6NIM