I have tried the transfer with cleaning the boards and without and I couldn't see much of a difference.
Sounds to me like the Toner you are using has a higher melting point than other toners.
--- In Homebrew_PCBs@yahoogroups.com, kabowers@... wrote:
>
> On Wed, 23 Mar 2011 13:43:32 -0700, you wrote:
>
> >Scotchbrite is a line of abrasive products from 3M. The green colored
> >pads work well. I got good results by using the green pad and water to
> >remove the surface layer, then soap + hot water to remove the bulk of
> >dirt and oils. After drying, I used a clean, lint free wipe and acetone
> >to make sure the surface was free of oils.
> >
> >I also found that different irons vary significantly in how hot they
> >get. One of our irons worked much better than the other.
> >
> >You may want to check into a laminator instead of an iron.
> >
> >-Pete
> >
> >
> To prepare a board for toner transfer I've had good results by first
> giving the board a really good scrubbing with green Scotchbrite and
> dishwashing detergent. I follow this with a hot water rinse. Then I
> spray it down with Orange Blast and let it sit for a few minutes.
> Next is a good rinse in hot water. Finally I wash the board with 93%+
> Isopropyl Alcohol from the drugstore then dry the board with a fan.
>
> I like the alcohol instead of acetone; I think it's easier on the body.
>
> Keith Bowers WB4LSJ- Thomasville, NC
>