philba said:
you should go visit the yahoo group. that is where the guys that did that page hang out. I believe there were some problems with uv curable but didn't pay that close attention.
The reference in my post was to the yahoo Homebrew_PCBs site as the place where I got the information. Unfortunately, I was not completely clear on that point.
It seems that group's focus on UV curable ink was to use UV LEDs essentially to mill the traces, and you are correct, there were problems. The current fad is to heat fix Epson-compatible yellow ink, which is preferred to other colors, before etching. Apparently, it sticks quite well, but there are also indications that not everyone has had the same luck (as always) and the baking temperature seems to be critical.
The OP question about printing directly on a bare PCB is apparently and relatively easily solved by using the Epson inkjet printer heads.
My question was whether anyone on this forum had experience with applying a UV curable ink -- such as a negative or positive resist of suitably low viscosity --, and then exposing the whole board to UV to cure it. I did not find any references to that hypothetical process on the yahoo forum using its search function. But again, not all of the 16000 posts may be accessible by that function.
As a follow-up question, has anyone used the DuPont Riston or other brand negative-resist films to make their own boards. John