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

Yes I have found the same issues. The board must be heated to around
60 celcius and remain that temp while it runs across the head. Not
easy. I have to hack apart a heat sealer or laminator to try getting
it to work and feel that attempt would probably be another score to a
fatal try.

But the thermal ribbon material is really interesting! Its a thin
plastic clear ribbon coated with black wax, or wax/resin, or resin
(depending on how much $$$). Once an image is printed, say to paper -
it leaves an image on the ribbon for the parts that didnt print. I
printed a circuit-board in reverse, and was left with a positive image
on the ribbon. With the correct amount of heat and pressure it is
possible to seal directly to the copper - much like a toner transfer
method.