On Tue, 26 Sep 2006 12:21:25 +0100, you wrote:

>I do not know if this is a good procedure or not, but you can read it on
>Maplin's site:
>
>Single and double-sided copper clad SRBP and glass fibre boards coated with
>a positive photo-resist suitable for use with our UV exposure box. The
>boards are covered with light proof protective film, which should not be
>removed until the board is used. The PCB should be exposed using our UV
>exposure box and a circuit overlay transparency. Exposure time will be from
>8 to 15 minutes. Mix together 0.5l approx with one teaspoonful of sodium
>hydroxide (available from most chemists) and pour into a tray (CH38R).

NO NO NO. DO Not use Sodium Hydroxide - it totally sucks ( see my page for why), and is the primary
reason for homemade PCBs having a reputation for unreliability & poor repeatability.
Get some silicate stuff. You'll be glad you did.  

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