Homebrew PCBs

>Since Kepro went out of business, I need to find a new supplier of
>presensized negative acting photoresist material . I tried some positive
>material from Injectorall, but can't seem to get a decent board from it. I'm
>sure it will work after I figure out the correct process, but that can get
>pretty expensive.
>
>Ideally I'd like to find some place that provides the same type of material
>as Kepro had. It was a 1.3mil thick laminated negative acting photoresist,
>Riston EM312 Photopolymer film made by Dupont. It was developed with sodium
>carbonate.

Isn't Bungard also selling in the us (asuming you live there)? They do
have a photoresist from an english manufacturer (sorry, don't have the
name handy) and the resist works very well. From what you describe it
seems to be mostly the same thing as you had.

Markus