Eric,
Be sure to shake the can before you spray!
John
--- In Homebrew_PCBs@yahoogroups.com, "ednspace" <ed@c...> wrote:
> Hello,
>
> This is a plea for help!
> I am on my 5th trial with this and while each trial improves
somewhat
> in end quality, and certainly in the process, (no longer spilling
> solvent all over the basement), I still have yet to produce a board
> that I thought could be etched.
>
> The traces are very weak to washed out to non existant. At first I
> thought I was under exposing now I suspect I am over exposing or
just
> not getting a good build up of the resist on the board to start
with.
>
> I am looking for someone familiar with this method to bounce a few
> emails with so that I can get it right.
>
> At this point I am:
> In a 60watt bug light environment (Problem?)
> Coating the boards with makeup swab rather then spraying, much
nicer
> coat and no smears, nice and shiny, dust free mostly.
>
> Drying over night in a sealed shoebox, inside another box
>
> Using tracing paper as negative nice black laser print (Reported to
> work in many places)
>
> Exposing with a 250watt photoflood for various times and developing
> following supplier instructions with the recommended developer.
>
> Exposure times have been, 22, 10, 5 with a couple of retrials in
> between, no, luck. Any help would be greatly appreciated.
>
> Thanks,
> Eric