In article ,
David W.E. Roberts wrote:
Wipe it off when cold?

Yes - if using a modern flux it's water soluble, and comes off easily. I
think the original article is referring to Fluxite type paste - which
isn't as good anyway.

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*Avoid clichés like the plague. (They're old hat.) *

Dave Plowman London SW 12
RIP Acorn