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I don't use an etchant bath anymore. I just get a small piece of foam
rubber and use it like a sponge along with a couple of tablesoons of
etchant. Dab, blot, wipe, whatever over a dish and within ten minutes
your board is done.

The cheap yellow toner transfer paper on eBay works better than magazine
paper for me and my current laser printer.

Cheerful regards, Bob



On Mon, Mar 9, 2015, at 08:52 AM, John Coppens wrote:
> Hi all...
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> I've been doing toner transfer PCBs for quite some time now. I switched
> to
> clay-coated paper, which works very well, but the remnant of clay which=20
> sticks to the toner seems to react with the etchant and generates
> bubbles.
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> As I also accustomed to float the boards upside down on the surface,
> these
> bubbles interfere with the etching.=20
>=20
> Anyone experienced this?
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> John

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