I'm in New Zealand so it RS probably Australian stock and its the spray on
stuff from a can although I might try the pre coated boards.
> Are you using pre-coated boards or coating them yourself?
>
> The uneven etching due to resist remaining after development is a sign
> that
> it might be old stock, if the boards are pre-coated. Is RS Radio Shack or
> RS
> in the UK? The latter will be OK.
>
> You don't need to dry the boards after development, just rinse them well
> and put them straight in the etchant. I use ferric chloride because it can
> be re-used many times,unlike ammonium or sodium perchlorate.
>
> Leon
> --
> Leon Heller, G1HSM
> leon.heller@...
> http://www.geocities.com/leon_heller
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