Homebrew PCBs

Try contacting a local PCB fabricator and see if they will 
sell you the last 10 meters off the dry film rolls, when 
they next do a change over on the hot roll laminator. You 
might like to cut it in 300x300mm squares for convenience, 
then store in black plastic bag, in the fridge, and it will 
last for many years.

As for the applying the film, I've finally got it worked 
out. You need to get hold of a rubber roller like that from 
ink printing machinery. Here, I took a few photos to show 
basically what I use to put the film on the board and 
process the photoresist. Excuse some of the poor quality 
photos, I wasn't taking my time to do a better job.


http://members.optusnet.com.au/~eseychell/pictures


These two images show a magnified view of a pattern in the 
photomask and the same pattern developed on the photoresist.

http://members.optusnet.com.au/~eseychell/pictures/Epson_inkjet_film.jpg
http://members.optusnet.com.au/~eseychell/pictures/resist_image_on_copper.jpg

Ron Amundson wrote:
> 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.
> 
> Any ideas
> Ron
>