Homebrew PCBs

Hi Leon,

What resist (positive or negative) are you using and where do you buy 
it?  How do you apply it to boards?  When I was in junior college, we 
used to spin it on.  How long will presensitized boards keep?  How do 
you dispose of your expended chemicals?  I'm on a septic system and am 
very careful about what I put down the drain because I or my neighbors 
will eventually end up drinking some of it...

I'd like to try doing boards with a positive resist.  It would 
probably give more predictable results, once you got exposure and 
developing times down, with less pitting.

Regards,
Dennis

--- In Homebrew_PCBs@yahoogroups.com, "leon_heller" <leon.heller@...> 
wrote:

> Why not use the UV exposure technique? It's much simpler and quicker 
> and the results are excellent.