Hi Chris,
My experience:
Pre-coated boards: Good sometimes but expensive and sometimes poorly cut (raised edges have to be filed down before exposure) and occasionally unevenly coated meaning it's hard to get consistent results. My experience is they have a shelf-life (older = longer exposure time) which again causes inconsistencies if you don't make many boards at one go.
Spray on/sponge on "Seno" type products: No joy at all; impossible to get even coatings.
Riston type laminated film: Very, very good indeed once you've mastered the art of laminating. Definitely worth shelling out the £10 or so for a cheapo laminator. Very cheap chemistry. No shelf life that I've seen. Very consistent results. Can also be used as a poor man's solder mask. Buy flat sheets (eBay China) not the cheap roll ends which curl up every other whichway when you're trying to apply it.
TT: No way near as easy / repeatable as film. Good for applying legend with Pulsar TRF though.
Bob
--- In Homebrew_PCBs@yahoogroups.com, "matrice197" <hololight@...> wrote:
>
> I want to create some PCB's using the uv photoresist process. I dont often need to make boards, but would really like to do this rather than TT.
>
> Considering the small amount of boards I would be creating, pre-sensitized boards would likely make the most sense, but I would like another option.
>
> I looked at a roll of the photosensitive laminate (I dont have a laminator), and also the spray(poor results?, short shelf-life?).
>
> What is my best bet?
>
> Thanks,
> Chris
>