Rich said:
> Tomcat spray also works well for pre-paint etching of aluminum
Soemwhat easier and more controllable is caustic soda (sodium hydroxide).
Readily available (or at least was - I wouldn't bet on it still being so
with the modern environmental police) for drain cleaning - I believe a
proprietary name in the US is 'Drano'.
On some alloys, it leaves a blackish shading: a dilute nitric acid dip gets
rid of that, but somewhat easier is to use a cloth well soaked in vinegar.
The exercise is best done in a well ventilated place because hydrogen is
given off.
73
Peter G3RZP
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