Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "lcdpublishing" <lcdpublishing@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, November 17, 2005 3:55 PM
Subject: [Homebrew_PCBs] Re: A $500.00 "UV" non-trivial exposure box.....


> ANother thought I had about using the photo-resist boards was the
> potential for another problem that I don't know if there is a work
> around or not.
>
> If you expose a board and the exposure doesn't work out as planed,
> it is then ruined isn't it?

When you get the process right, that is very rare.

>
> For example, with toner transfer, if it turns out bad, a missing or
> pitted traces or whatever else can go wrong, I wash off the toner
> and do it again and again till it is good enough for what I need.
> The only loss I have is time and paper.
>
> However, from an ignorant point of view ( I have never tried this
> process), if something goes wrong, the board can't be used again in
> the potoresist process can it?

Not unless you strip off all the old resist and use dry-film or spray
resist. The latter doesn't work very well.

>
> Also, as I don't know what things look like along the way, can you
> see the traces with the resist on them after developing? If so,
> what does the developed photoresist look like?

There is a faint image after developing.

Leon

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